. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology). THE INHERITANCE OF DURATION 153 sweep in their passage over the span of life as has the general population life curve discussed in the preceding chapter. The descent is a little steeper in early adult life. The female curve diifers in two respects from the normal general population curves. In the first place,. O 'I I I t I I I L^J I I \ I I I I I I ^>~--^ B 5 10 15 ZO ZB 30 35 40 -tS 50 is 60 65 TO 7S SO as 90 9S A6E Fig. 41.—Showing survival curves of members of
. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology). THE INHERITANCE OF DURATION 153 sweep in their passage over the span of life as has the general population life curve discussed in the preceding chapter. The descent is a little steeper in early adult life. The female curve diifers in two respects from the normal general population curves. In the first place,. O 'I I I t I I I L^J I I \ I I I I I I ^>~--^ B 5 10 15 ZO ZB 30 35 40 -tS 50 is 60 65 TO 7S SO as 90 9S A6E Fig. 41.—Showing survival curves of members of the Hyde family (Plotted from Bell's data). beginning at age 15 and continuing to age 90, the female curve lies below that for the males, whereas normally for the general population it lies above it. This denotes a shorter average duration of life in the females than in the males, the actual figures being years for the males and years for the females. Bell attributes the dif- ference to the strain of child-bearing by the females in. 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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