File:The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 (1908) (14592050148).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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entage Increments in WeightOF Female Guinea-pigs. this change in the rate of growth which will perhapshelp to illustrate it; and in the next of our pictures(Fig. 30) we see this other form of representation.The first vertical line represents the length of timewhich it takes a young male guinea-pig to add ten percent, to its weight the first time. Here the thirdtime—the fourth—the fifth—and you see as it isgrowing older and older it takes the animal longerand longer to add ten per cent, to its weight. Finallywe get to the nineteenth addition, and we see thatthe period is very long indeed. How long thatperiod is we can judge by the figures upon the left,which represent the length of the periods in days. THE RATE OF GROWTH 97 From the base line to the one marked ten is a pe-riod of ten days, and you see that the guinea-pig inadding to its weight ten per cent, for the nineteenthtime does it so slowly that it requires ten days andmore; for the twenty-first time, nearly twenty; for 50
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Xem^o^ o^ W% -PeA^cod^. 7/ki^ 40 30 20 10 i^eAlod.i 4^ 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 ZZ 23 24 25 Fig. 30. Curve Showing the Length of Time Required to Make EachSuccessive Increase of id per cent, in Weight by Male Guinea-pigs. the twenty-second time, nearly forty days. At lastthe number of observations becomes small, and thecurve grows irregular. Thus we demonstrate that asthe animal grows older it takes longer and longer toadd ten per cent, to its weight. In the other sex, asthe next slide shows, (Fig, 31), the same phenomenacan be clearly demonstrated ; here are the periods as AGE, GROWTH, ANU DEATH before, lengthening out, as you see, at first; then be-coming very long indeed. In the following slide Ihave another form of representation of this same phe- 70 JC^m^atA oi W% p€A.covU 3€mta£&^. 60 50 40 30 20

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