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MAcGuEaou, D.Sc. (Read May 23, 1888.) It has btH'ii found by oxporimont that in gonoral tho volumo of any body at temper- aturt' f may be. oxprcsscd in terms of its volume at any other temperature r", and of tho difference of temperatures, by means of the expression, V,^V^ {\^AQ-r)^Bit-ry), (I) where V, and V^ are the A^oluraos at f and r' respectively and A and B are constants for the substance of which the body consists. In some cases au additional term C{t — r)' is necessary.. But in general the value of (7 is so small that it may be neglected. As the constants A, B, C have different values for different values of r, it is con- venient to choose some one temperature as a temperature of reference, and for this purpose the teniperaturt o^C is now universally chosen, the above expression becomiuo- therefore, "~F(=F„(l+a« + 6f).* "^ " ~ ' (2) The constants a and b (and c also, the coefficient of f, in cases in which a term in f is found necessary) having been determined for any substance, the volume of any body of that substance, whose volume at o°(7 is known, may be determined at any other temperature within the temperature limits of the experiments by which the Ai^alues of «, h and c were found. Density may be substituted for volume in the above formula, provided the signs of a and b be changed. For if p, and p„ are the densities of a substance at f and o° respectively, we have, in general, fj,/fj^-V„/r,= \/(il + at + be)=l-at — bt\ since a and b are, in general, small quantities. In the case of isotropic solids, length may be substituted for volume in the above formula, provided tho constants a and b be divided by 3, change of length in any direc- tion in such cases being numerically equal to one third of the corresponding change of volume. The formula in thci case of the linear expansion of such solids becomes there- fore : — In the case of seolotropic solids, the linear expansion is different for different directions, and must therefore be specially d<^termined. a ♦ PROF. J. G. MACGRRGOR ON and Heiuo To aotormi)>o tho vuluinc iit /'" wh«n that at f is givon, we have :— I". = V..{\ + atJrbf'), Vi-= F„(l + af+bt''). V = V ^ "^ ^^'+ ^^"' ' 'l+at + ltf, - =V,{l + a(t'-t)+bQ''-f)), (4) since a and h arc ismull quuntitit'H. '1'^^- "'^''"* ''''••*'"* "•■ tlK'i-miil o.xpausion betwiMMi two temperatures is by some writers delined as llu' .lumge of volume per de-n-e and per unit volume at the lower temperature, and by others as the change of volum.^ per degree and pt.r unit volume at the tempera* un. uf .•..n-ren.e {o°C). In terms of the symbols used above, it is in the former ease the v alue of ,*/' 7_^^, and iu the latter case the value of ^'' 7 ^' . From (4) it follows at once that : — provided a and h are f^o small that their powers and product may be neglected. From (2) and a similar equation with t' substituted for t, it follows that :— r,-i\^r..{a(t'-t) + b(t''-f)) exactly, and therefore that F„- V K.^-O^'^ + *('' + '). m o ftuiucicntly small, '.vhatever tl1^i^^"!lffrrnTfr oi a aiiu ^/ iiiuyue. a ro v Juea u aiiu u aro therefore, tlit; mean eoelli/ient has the same value between given temperature limits aeiording to both modes of delinition ; and if o and b are known, this value may be de- termined for any temperature range. The " true" coeliieitMit of thermal expansion at any temperature is the rate at which volume varies with temperature at that temperature per unit volume at zero. It is thus 1 dV, v' <, the same as the value of the true coefficient according to the former definition. The following table contains the values of a and h (and of c also in cases in which c is found to have an appierial)l(! value) iu the case of the more important and interesting solids. A table containing an exhaustive list of the determinations of these constants would be so long thai iu most cases I have thought it well to give only the most recent and most accurate determinations, though in some important cases, as in that of glass, a rUBrOAL KXPANSION^ OK SOLIDS. 9 b largo number of such fletermiimtioiis hiivo been given. Many obsorvors of thorraivl ex- pansion have dotermiii.id, not the value.s of the eoustants a and h, hut the values of th(^ mean ooeflicient throughout given ranges of temperature. In many ca.ses, esi)e.ually iu cases in which the values of a and h are not known, these rc.sult.s have been given. They are contained in the" Iburth column, aud in the fifth column are stated the t. (commercial). Do. j Aiding (in powder) — Anirn->iiium-AIuiiuu- iiiiu Alum Potassium-Aliiinin- iiun Alum a X 10" Riil)i(lium-Alnmir.- j mm Alum f'resiiim-Aluminium Alum rotassium-Chrom- ium Aluui . .. . Ammonium Sulphate. Antimony Ro. (pure) l>o. (crystal) . 6004 /- X 10" 3435 c X 10" 2770 3387 3970 870 Mean Co- l'e''',I'"niture ellicient x 10" ,"l\*5e" 7008 6000 7430-4 7002 2840 2585 5343 2635 4108 31118 2070 2635 5045 2610 2621 7699 2330 4968 59503 8335 9051 11191 3167 2940 3379 0—100 0—100 0— 100 0—100 0— L'O 0— 60 0—100 C- 2" 0— 60 0— (H) 0— 20 0— 60 0—100 0— 20 0— 00 0—100 0- 20 0— 60 0— 80 0— L'O 0- 60 0— 100 0—100 0—100 0—100 OlLSKUVKH. Fizoau Calvoit, Johnson & Lowo L. I'fuir (Jlatzol Spring Mntthifssen Calvert, Johnson & lyowe Fizeau 6 I'UOF. J, U. MA(!(H{K !.';!06 1800 1 2485 0—100 (1 Beryl 105 0—100 K. I'fafr Bisnintli 3502 44Cf) 3948 0—100 Matthiosseii Do .nnnn 0—100 Ci Ivert, Joliiisoii & Ixivvo Do. (cryBtiil) 3700 4155 4121 0-100 ]'i/.eaii Bras- (71 y, hy muss, 00 15 % by volume, of Cu.). 5101 5580 1 5719 0—100 Afattliiessen Do. (71-r) %of Oi, 277 ofZii.Oli of 8ii, 05()f I'b) 5341 2940 5037 0— lOO Fizeaii Bvomiile of Silver (IlK'Hr) -1 10100 10429 — 60~ 0—100 Kodwell Bronze (HOI! •%. of Cii, 9-7 of Sii, 4 ofZii.) 6101 3060 ' 11033 5406 0-400 0— 100 Fizeaii Do. (25%ofSn.) 6532 106-100 Daniell Cadiniimi 807S 14000 0478 0—100 Mattliief>8en j)o 881G 4890 9303 9300 0—100 0—100 Glatzol Vizeau i)o. (<'oin pressed 1641 39-5_405 11 Do 2010 07000 0—1 flO 0- 30 F. rfaff Russnor CafHitclioue (commercial srrey) Do. (vuk'iinized, nn- 95784 14— 37 I^bodeff Do. do. do 07040 11—295 II Do. (ilo., stretched). . 50158 14-5-37-5 « Do. do. do. 60900 12-5- 30 11 Ca' 1)011 (graphi te) 877 16-0-100 Daniell Do. do 032 16-6—360 - mass, 48-00% by vuluiiio, of Gold). . Copper Oxide (CuO.). Corundum Daroet's fusible metal (Bi„Sn,„PbJ Diopside Ebonite (See Vulcanite). *En)erald Kpidote Felspar (Adnlar) FhiorKpar Galena Garnet German Silver Glass (crystal of Clioisy- lo-Koy) ax 10" Do. Do. Do. do. do. (ordinary) . . 3012 4443 4788 4850 4015 27 1443 16 2027 13i)3-,' 2231 2523 2439 2578 /;XlO" 1200 5560 3075 2740 6420 3150 3275 1900 3830 1900 ex 10'" 50 70 300 1330 Mean Co- T''"'P«'-'Uure efllciontxlO- "^';'^'K«- 0-37 0245 I —60— 0492 j 0—100 0H05 ! 0—400 3732 I 5150 5650 4008 5094 6124 5205 6233 6115 4057 342 1771 52143 -30926 102534 2330 206 2410 1590 5851 5578 2543 5509 0—100 0—100 0—300 0—100 0—100 0—100 0—100 0—100 0—100 0—100 0-100 0—100 0— 35 35— 50 60— 00 0—100 0—100 0—100 0—100 0—100 0—100 0—100 0—100 100—280 OlINKIlVI-lK. Uodwoll il II Vizoau nulong & retit 14 MattliioHsen Fizeau II L. Pfaff Hod well Glatzel Mattbiessen Fizeau Spring tt II F. rfaff. Vizeau II 41 F. I'fair 4( II L. I'faff Bosscba t * See also Beryl. t Bns9cl)a's constants were obtained by a recalculation of Rognault's experimental results. I'liOF. J. (i. MA(X}«KCiOJ{ ON Sl'IIHTANCH. (J)nM (crystal of ("holny Ic-Koj) (onliimrv).. Do. l),i. Do. (k'rceii)... (Hwodisli) Do. ((Tyntnl, Choisy-Io-Roy) »?;. (ordiiiiii-y). ■ Do. (rod) Do. (tube) Do. (i)luto) Do. (crown pinto) Do. do Do. do Do. (thin tube) Do. (wbite, French). . . Do. (white, tube) Do. ( do. globule) Do. ( do. do. ).... ox 10" 2507 21.'81 2143 2218 6x10" 0x10" Mean Co* e/ltciuntxlO' 1920 0-51 1540 046 800 0-37 3670 116 2410 1700 688 31500 reniiKirnliire KnnKi). Qbhrhvhii. 227(» 2270 2280 28.10 I 2310 i 2320 2330 2340 2028 2687 2761 2835 2008 2082 .3050 :!131 2580 2750 3040 2435 2073 2027 2(i93 2753 2553 2G48 2592 2514 100—280 BosNclm * 0— 10 . Rognault 0—60 " 0—100 " 0-150 0—200 0—250 0—300 0—350 0— 10 0— 60 0-100 0—150 0—200 0—250 0—300 0—350 0—100 0—200 0—300 0—100 0—100 0—100 0—100 0—100 0— 30 0—100 0—100 0—100 0—100 Dulona &. Petit Lavoisier & LaPlace IliiUstrom Kopp Regnault I * Bosscha's constants were obtained by a recalculation of Regnault's experimental results. CUBICAL KXI'ANHION OF HULIDS. I StmilTANOI, a X 10" /.xlO'i cxlO'" Moan Co- Kdii'lentx 10 Tomimratiiro « l(iiii)ie. OiuiHKVi'm. Glais(groon,tubo) 2201) 0-ino Rogiiniilt. Do. ( (1(>. Klolmlo).... 2132 It— 100 it Do. (8wiHli(tli,tiil)o).... 2303 ; 0-100 .. 2741 0—100 ,, Gold 4075 , .3301 4411 0— 100 Maltliiossen Do. (cast) 4221) 1245 4353 0—100 Fizoau Do. ( Dure^ 4140 0—100 ( 'alvert, .loliiison i<; Do 4401 Lowe L. Pfair 0—100 Guttii-iitMclia (i)nri(i('d).. 40U00 4!)(I000 (iOoOO 0— 40 Rii.ssner 0700 0040 i 7304 7500 0—100 0—100 I'izean V. rfair Do 2355 I 3025 2058 0—100 Fi/eau Ice Do 11250 15850 -20— —20— Bninner ri linker & Geissler Do ... . ! Indium (cast) 7424 03570 \ 3500 13782 — 12 — 0—100 Maroband Fizoau Iodine 1 r 23500 (?) 1 31231 40-3— 107 Billet 1 Sec. Ill, 1888. 2. ; II to Hl'llHIANia liKlitlei— Atil ^l'ryHtl^l)■ l>ii.(ri)m|)r(iHH(«l pri'ci pilalo) I'i).(''n8t). Ho., Do. , ri>.I,(nihU. Do Do.. Hg.I, (ctwl) Iridium {va»{) lmfr(.f<'r),'t«r) Do. (wiro driiwii). Do. (ioft) Do. ((-ast, grey)... Do. (cast) Do. (wroiijilit). D( Do Do Iroii-i^lniico (oxido, rlioni boliudrio) Iron-stone (niagnotito). . Iron Pyrites Do LiiOTwitz'sFusiblo Metal (Bi„ I'K C.l, Sn^) ... Lead ri{(»i'. .1. (J. M.\<;(jui; (»;17S-(1 20f)ri 15408 3010 U'l-M 1 81 I, X 10" —7640 — '.'ino — L'lOO 87tlO 1185 2775 20,'),5 S215 2220 C X 10'" ottlrlent X 10- "*'/f,"' - 282 —458 ■ —2411 --1740 -450(KI0 2814 -8(110 28411 10255 7(114 81117 ();!7H0 180(»0 !l52;t 2124 .'11)01 ;!7a) :!(i84 32;!5 3:'>(>() .'i570 :!742 :;:i(i7 4i(;i 2:.C5 28()2 ;!025 2721 15400 —31)514 S8;!81 8390 0—100 0-100 0-100 70-142 142-14B'5 1455— 300 —(10—142 142—400 0— lOO 0— 2(r) 0—205 205—253 253— ,M. I'. 0—200 0—100 0—1 (Ki 0—100 0—100 0—10(1 0—100 0—100 0— lOO 0—100 0-100 0—100 0—100 0—100 3fl.5_40-5 0— 25 25— 40 40— 00 0—100 ( )MHRVnH. I'lMiaii UcMlwell Kiwsan Kodwell Ro\ vol. of I'l..), MttKiinHliim (I'lMt) Do Nickol (('(imp. |Hiwil«r). .. (Mniiiiiii (Mfuil-fuwul) I'ulluiliiiiii Do. (fortsud, aiiiioitled) I'lirutliii Do. (IiIkIi lioiliii^ IXjilll) Po. (Rivnj!;()oii, iiielt- Powter Do Pliosj)lionis. ... Do Do. Plittinnui Do Do Do Do. (cast). H087 TM 3761.' ITOO :!(i;n; ;m7o 58400 lir.ooo * 7ltir,i ;!71t88 ;!8:!00 20000 2554 2603 3320 Krjiio 10()i') 3270 2H(H) 1080 00200 (iOOOOO 148800 11500 1040 1170 MHO 8280 7042 3M58 2037 3312 3507 200(KI0 (KIOOOO 31',).sr. 30000 143118 244;!r)8 70080 0000 5082 20506 2(i44 2050 2750 2(158 2721 "These constants are for the formula :— V'= V„ {I + at + hi'). TenitNiratiiru ltitn^M<. (MlHKIIVKII. 0-100 (;»lK.it, .rotiiiHon A f l.— 48'85 48-85-OMl 0- .50 lii(i— loo lO'O— 20(i 0-375 0— 44 0— 44 lOf)— 100 0—100 0-300 0-100 0—100 I.. IfHlI Itixlwull 0--I0O (ilalM>l iMiittliU'MmMi I-. I'lall' Kiwnii 41 .MatUiidNHen I'lzoaii ItiiHHnor Rod well l'"iz{iau l>imii>II 4( Erinan Kop|) I'isati & (.If I'rnnchls Daniell Dnloiij; and Petit Mattliicsson Fizeau 12 IM101<\ J. (i. MAC(tRH(J01l ON 1(1 ■■'i f I ■ ^ ' Sl'nsTANCK. FlAtinum Do. (I'oiiiiiiercial). • I'liitiniiiu-iridiiim alloy (l()%of Ir.)((^a8t) Purrclain (Hayonx). Do. do. .. Do. Potassium I'otassiuni Cliromate- rotassiuin SiilpliaU.. . QuaTt/, Do RliodiuuiCseini-l'iised). . Rock Salt Rose's Fusiblo Metal t Do. (Bi;Sn„ri),). f Uubidium Suipliate. . . . ■{ I I Htitl'.eiiium (seiiii-fiised) Riitile Seleninni (cast) Do. (rTystallized)-{' l( X 1(1' L'5(!l 24070 2^800 2451! 1 1578 (>784-/ 2.-)52 2U« 9702 /.xlO" 1140 17980 2;!870 :5265 1215 67^5 -181580 421i', 2225 16725 ex 10 I \f„.,„ ■-',> Temperature 1,1 Moan I o- | Ha,n,e yflicientxioi *^i'^K*' 5530;t! 2583 2040 2(175 4950 0000 800 24990 10570 107;U 11344 9520 10037 12045 3685 3840 2574 12252 33575 -129922 54545 9760 10020 11148 2973 2419 11376 14780 17430 19810 OlWKdVEIl. 0—100 0—100 0—100 1000—1400 aljout ar.d above 1500 0— 99 0— 50 Hagen 0— 20 Sprint; 0— 60 0— luO 0— 20 0— 60 0—100 0—100 Fi/.ORU 0-100 V. Pfaff 0—100 Fizeau 0-100 0— 90 Kopp - 4C Spring 40— 55 55— 90 0— 20 0— 60 0—100 0—100 Fiiieau 0—100 0—100 0— 20 [ Sprin 0— 60 0—100 T,. Pfoir Calvert, .lolinson A I. owe Fizeau Dcvillc & Troost Wuinliold t Kopp uses the formula -.— V, = K (1 + at + hC + c^ + rf«<) ; a, h, aiul r. are triven in the table ; rf= 10"" x 5250. ; Ernian (Jives the formuhi:-F,== ^(1 + lO-". 21864<-10-'.9.3485 s/(<-34°.9) (78°.5-(), the temiieratures l)i-iiijr expressed in Reaumiir decrees and tlio imaginary values of the irrational factor being put ei|ual to 0. CURrOAL EXPANSION OF SOLTDS. 13 < 5256. atures SUBSTANCB. S«Iuniuin(i-oin. jMiwdor) SlliRon((!aat). Silver Do. (CHSt) . Do Do Do , a X 1()" Silver-p'.atinuin alloy (33'4 % by mass, and l!)-65 % by vol , of I't.) Bodium. Do. . Do. . Solder (2 parts I'b, 1 Sn.) Spei Ilium Metti'. Steel v5i"t ter.ipeiod) Do. (tempered yellow) . Do. (French cast, teni pered) Do- (French cast, an- nealed Do. (English cast, an- nealed) Do. (wire drawn) . Do. (soft) Do. (bar at max. soft- ness) Do. (same bar at max. liardness) Sulphur Do Do. (Sicilian crystal). Do. (crystallized \ from solution j in Carbon Bi-^ Bulpliide) ... j L'()8(> 54 '.'G 5587 4246 14178 20510 20280 3103 10458 -83804 15222 /-xlO" 25:!5 4050 2205 3220 52000 22730 25730 2280 2C5880 7878840 § 50440 • X 10" etiicientx 10' ,, r< Temperature Mean Co- ,.;^„^,p Ouhkhvkh. ft'.) ] l:!070 16440 17510 2340 5831 5808 5510 5573 5702 4568 16674 23670 21630 7524 679fl- 3238 41.")8 4086 0— 20 Spring 0— (iO i " 0—100 ' i 0—100 ; Fizoau 0—1(10 ; MatthicsHtn 0—100 I Fizeau 5— 26 i Plantamour&Hirsch 0—100 L. I'faff 0—100 R(xlwell 3330 33; ;i 3768 3090 3270 4260 —146-73 20244 1 21220 24380 I i 35410 0—100 0— 40 0— 90 0— 50 0—100 -O-'-KKV- 0—100 0—100 0—100 0-100 0—100 0—100 0—100 0—100 0—100 0— 78 78—115 0—100 0— 20 0— 60 0—100 Matthiessen de Luc!,,„„, ellicentxlO", ^^f)"' 2i:i00 0— I'o i L',-)0(IO I 0— (iO •JOOOO 0—100 I 20408 17590 19991 —4410 2848:! 20958 — 137:!1 201700 18246 —2.'" '.85 195180 10320 11210 11000 10410 10110 10630 5190 9405 6889 6807 6507 2137 2181 6099 5856 24239 24600 4C000 OllSHItVHR. Kjirint; 0— 00 20',5— 21-5 0—60 62— 70 70—110 0— 82 82— 85 85—100 0— 90 mi— 92 92—100 0— 20 0— 60 0—100 0— 20 0— 60 0—100 0—100 0—100 0—100 0—100 0—100 0-100 0-100 10-G— 100 16-6-264 16-7— 35-4 18— 19 20— 60 liussner Schranf Scichilone Sprinj; rizean Mattliiessen Fizeau L. PfafT V. rfaff Daniell Xohlrausch Kuoss KuB.suer CUUIf'ATi EXPANSION OF SOLIDS. m SuiWTANfM. a X 10- ?>xlO" 1 fxlO'" Mean C"o- afliuient x 10" TeiniKjralnrn Kango. (X'.) OUHHUVBIt. Vulcanite (27 jior cent, of Sulpliur) ^ t , , , , , , ,,, J ;«000 20— 60 Russner Do. ^;i0'7 [ler cent, of SuljOiiir) 23000 20— 60 H Do. (31 .ler cent, of Sni|iliur) 41000 20— GO (I Do. (3()4 per cent, of Sulphur) ••"'•'• 38000 20— 60 4( VVcod's FuBil)U> Motnl f (Bi, rb C(l,, Sn,,)... i —KiGOO 27827 0— 25 25— 70 Spring 41 .S222 7000 8919 8928 6G0O 16-6—100 0—1 OO 0—100 Daniell Matttitessen Calvert and Ijowe j)o Do. (pure, rollrd) Do. (comprosM powHer ! 8906 1905 8715 0—100 Fizeau Do 8063 0-100 i Rod well 1 LIST OF PAPERS BY OBSERVERS CITED IN ABOVE TABLE. BiLLCT.- 1,'Institnt, XXIIL (18r,5), p. 292 (.Jalirsber. d. Cliem. 1S55, p. 46). BoswiiA.— Archiv. Neerland. IV. (18G9), p. 197 (I'ogg. Ann. Ergiinz. Bd. V. (1871), p. 469). BjiuNNKH.- Pcgg. Ann., LXIV. (1845), p. 113. Calvbht, .ToiiXBos & LowK. — Clieui. News, III. (1861), p. 315. Chaits.— Conaptes Kendiis, XCI., p. 413. Daniell.- Pl.'il. Trans., ]8:!0, p. l.'57 and 1831 p. 443. Db LiTCiiL— Atti d. R. 1st. Venoto, (o), V. (1880). Dbvillk it TitoowT.— Jalini.sber. d. Cliem. (18G4), p. 70. DuLONO & Pbtit.— Ann. de Cliiiu. etde Pliy-s. 2 .scr.,T. II. (1816), p. 2,-)4 ((Jilbert's Ann. LVIII. (1818), p. 270); Ann. de ('him. etde I'liys., 2 ser., T. VII. (1817), p. 113. Ekman — Pogfi. Ann., IX. (1827), p. bbl. FiZBAU.— Comptcs Rendns, T. LVIII. (1864), p. 923 (Ann. de ChiuL ct de Phys., 4 ser., T. II. (1864), p. 143; Pogg. Ann., CXXni. (1864), p. 515) ; C. H., T. I.X. (1865), p. IIGI (Pogg. Ann., CXXVI. (1865), p. 611) ; C. K. LXII. (1866), p. 1101 (IVigg. AniL, C.XXVIIl. (I8ti6), l>. 564; Ann. de Chim. et de Phys.,4 ser.,T. VIII. (1860), p. 335) ; C. H., LXIV. (1867), pp. 314 and 771 (Pogg. Ann., CXXXIL (1867), p. 292); C. K., LXVL (1868), pp. 1005 and 1(»72 (Pi.gg. Ann., CXXXV (1868), pp. 372 and 381) ; C. K., LXVIII. (1869), p. 1125 (Pogg. Ann., CXXXVIII. (1869), p. 26). FvBHS. — Zeitchr. f. Instruuionteuknnde, 1. (1881), p. 390. Glat/hl.— Pogg. Ann., CLX. (1877), p. 497. v; :■•, . : Haoen.— Wied. Ann., XIX. (1883), p.436. : s-- , HXi.Lh PROM.— Pogg. Ann., L (1824), p. 149. KonLHAistH.- PogB. Ann.,CXLIX.(1873),p.577 (Carl's Reiiertorium, IX., p. 408 ; Phil. Mag., 4 eer., XL VII., p. 159). Koi'P.-Ann. Chem. u. Pharin. LXXXI. (1852), p. 1. (Pogg- Ann. LXXXVI. (1852), p. 156 ; Phil. Mag. 4 ser., IIL (1852), p. 268) ; Ann. Chem. u. Pharm. XCIII. (1855), p. 129. Lavoisiek & LaPlace.— (Euvres de Lavoisier, T. II., p. 739 (Blot, Traits de Physique (1816) T. L, p. 151). Lhiikdkkf. — Journ. d. Euss. phys. Ges., XIII. (1881), p. 246. Mauchand.— Journ. Prakt Cliom., XXXV. (1845), p.;254. -m PEOP. J. O. MACGRRGOR ON CUBICAL EXPANSION OP SOLIPH. Mattiiihsskn.— riiil. Trnii3. CLVI. (1800), pp. 231 and 861 (PliH. Mag. XXXF. (1866), p. 140; Pogg. Ann. CXXVIII. (1800), p. 5i;i and CXXX. (1807), p. 60). Pkafi', F.— IVW. Ann., CIV. (185S), p. 17.'iandCVII. (I85!t), p. 150. , pKAKK, L.— Krlant.'(Mi. Uosold. 1872 (Foitaohritte d. Pliysik, XXIX. (18711), p. 679). PiHATi it \)K Fkanc'iiis.— Ber. d. dentsoh. t^liom. Gen., VIII. (1875), p. 70. Pi,ASTAMormt HiRHCii.—' \ri;li. So. phys. (2), XXXVIII. p. :!7. Pi.i'CKEU & Gei8si,ki!.-1V|.T. Ann., LXXXVI. (1852), p. 205. RKOVAii.r.-Ann. .lo Cliim. ot de IMiys., :i st-r., T. IV. (1842), p. 04 (Mom. d. I'Acad., T. XXI. (1847), p. 191 ; Pogg. Ann. LV. (1842), p. 585. RonwBi.i,.-Pr()c. Roy. Soo. Lond.,vxiTI., p. 108; XXV., p. 272; XXXI. (1881), p. 291 ; XXXII. (1881), pp. 23 ond .540; and XXXIII. (1882), p. HI!. KornvKLi. ct Ki,i)Bn.-Cliem. Nows, XXXIX. (1879), p. 66 ; Proc. Roy. Soe. Land., XXVIIf., p. 284. Ri-KSNBK.— Carl's Re|)ertoi-inm, XVIII. (1882), p. 162. 8tin:Ai-K.—Wi(>d. Ann., XXVII (1880), p. 315. SciciiiLONE.— Heibliitter Wie