File:The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 (1908) (14775538151).jpg

Identifier: problemofagegrow1908mino (find matches)
Title: The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907
Year: 1908 (1900s)
Authors: Minot, Charles Sedgwick, 1852-1914
Subjects: Old age Growth Death Aging Growth Death
Publisher: New York, Putnam
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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eight in one day.From that the curve drops down, as you see, withamazing rapidity, so that here at an age of twenty-three days the rabbit is no longer able to add nearlyeighteen per cent, daily, but only a little over six. Atthe end of two months from its birth, the growthpower of the rabbit has dropped to less than two percent., and at two months and a half it has dropped toone. The drop in two and a half months has beenfrom nearly eighteen per cent, down to one per cent.,and the rest of the loss of one per cent, i-s extendedover the remaining growing period of the rabbit.Could we have a more definite and certain demon-stration of the fact that the decline is most rapid inthe young, most slow in the old ? It is not in thiscase any more than in the others the one sex that 1 Pe^tceyrdaae. Jyvotje/fne/ni^ JSaMv6) •• rnoA^ \i t \ \ \ h\ ^^^^^-^^^__ 03 8 3I8^3^83338 5 5 7 7; 10 64 l80aJcz^<^ -.?7f) Fig. 35. Curve Showing the Daily Percentage Increments in WeightBY Male Rabbits. 104
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iBO da^ 03&\3\B2i283iV 5538 Fig. 36. Curve Showing the Daily Percentage Increments in WeightBY Female Rabbits. 105 io6 AGE, GROWTH, AND DEATH demonstrates this fact, for in the female we findexactly the same phenomena, as the next sHde willshow. The irregularities are not significant. Thestrange dip at thirty-eight days, for instance, corres-ponds to an illness of some of the rabbits which weremeasured, but they rapidly recovered from it andgrew up to be fine, nice rabbits. If instead of measur-ing half a dozen rabbits, we had measured twohundred or five hundred, these irregularities wouldcertainly have disappeared. The females in the caseof the rabbits, as in the case of the guinea-pigs, arenot able to grow quite so fast at first. We see heresixteen instead of over seventeen per cent, as theinitial value, but the general character of the drop isthe same, enormously rapid at first and very slowafterwards. All of our cases, then, show the samefundamental phenomena appearing with di

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