id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
37894	Lowery, George H., Jr.	A Quantitative Study of the Nocturnal Migration of Birds			.txt	text/plain	35905	2277	71	birds seen against the moon in stated periods of time (Scott, 1881a get all-night telescopic counts of migrating birds. A. LUNAR OBSERVATIONS OF BIRDS AND THE FLIGHT DENSITY CONCEPT A. LUNAR OBSERVATIONS OF BIRDS AND THE FLIGHT DENSITY CONCEPT of flight paths (Figure 10); and the number of birds intercepted vector resultant, but the density figure includes all of the birds The distribution in time of birds seen by a single observer may be vector resultant of all bird flights at this station was N 11° W, and, station density for each of the two nights (5,800 and 6,800 birds, low flight density; twenty-two hours of observation there in March, April, and May yielded a total flight density of only 3,000 birds. directional flight trends of birds, suggesting that most night Observations on the nocturnal migration of birds. 1881_a._ Some observations on the migration of birds. 1881_b._ Migration of birds at night.	./cache/37894.txt	./txt/37894.txt