. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. NATURAL DEATH, PUBLIC HEALTH 253 accurate population data exist, furnish, a cogent demon- stration of the essential soundness and accuracy of this theory of population growth. Indeed, the facts warrant, I believe, our regarding this as a first approximation to the true natural law of population growth. We now are P SERVIA .. 1700 20 4O 60 60 1800 20 40 6O 6O I9OO 2O 4O 60 80 2000 2O 4O 6O 60 2JOO YEARS FIG. 63.—Showing the curve of growth of the
. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. NATURAL DEATH, PUBLIC HEALTH 253 accurate population data exist, furnish, a cogent demon- stration of the essential soundness and accuracy of this theory of population growth. Indeed, the facts warrant, I believe, our regarding this as a first approximation to the true natural law of population growth. We now are P SERVIA .. 1700 20 4O 60 60 1800 20 40 6O 6O I9OO 2O 4O 60 80 2000 2O 4O 6O 60 2JOO YEARS FIG. 63.—Showing the curve of growth of the population of Serbia. approaching the proper mathematical foundation on which to build sociological discussions of the problem of population. As a further demonstration of the soundness of this theory of population growth, let attention be directed for a moment to an example of its experimental verification. To a fruit fly (Drosophila) in a half pint milk bottle, such as is used in experimental work on these organisms, the interior of the bottle represents a definitely limited uni- verse. How does the fly population grow in such a uni- verse? We start a bottle with a male and female fly, and a small sample, say 10, of their offspring of different ages (larvae and pupae). The results are shown in Fig-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pearl, Raymond, 1879-1940. Philadelphia, London, J. B. Lippincott Company
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