. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. THE INHERITANCE OF DURATION 157 long-lived fathers which this group will have as com- pared with shorter-lived individuals. Figure 43 shows the same sort of data for mothers and offspring. Here we see the curve of great longevity of parents rising in an even more marked manner than was the case with fathers of offspring. The group of 50 30 20 10 511 PERSONS DIED -^o 407 379 PERSONS DlLD 40-6O 360 PERSONS DlLD 60-80 148 PERSONS D/£D 6O +. 50 40 30 10 40 60 80
. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. THE INHERITANCE OF DURATION 157 long-lived fathers which this group will have as com- pared with shorter-lived individuals. Figure 43 shows the same sort of data for mothers and offspring. Here we see the curve of great longevity of parents rising in an even more marked manner than was the case with fathers of offspring. The group of 50 30 20 10 511 PERSONS DIED -^o 407 379 PERSONS DlLD 40-6O 360 PERSONS DlLD 60-80 148 PERSONS D/£D 6O +. 50 40 30 10 40 60 80 - 4O 6O 8O - 4O 6O 8O - 4O 4O 6O 8O + 4O 6O 80 + 4O 6O BO + 4O 6O 6O &O - 4O 6O 80 8O + 4O 6O GO + FIG. 43. — Influence of mother's age at death upon longevity of offspring. First dot in each diagram shows the percentage having mothers who died at 40; second dot the per- centage having mothers who died at 40-60; third dot the percentage having mothers who died 60-80; fourth dot the percentage having mothers who died 80+ (After Bell). offspring dying at ages under 20 had only 19 per cent. of their mothers living to 80 and over, whereas the group of offspring who lived to 80 and beyond had 41 per cent, of their mothers attaining the same great age. At the same time we note from the dotted line at the bot- tom of the chart that as the average age at death of the offspring increases, the percentage of mothers dying at early ages, namely, under 40, as given by the first dots, steadily decreases from 17 per cent, at the first group to just over 5 per cent, for the offspring dying at very advanced 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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