Life Tables: Founded Upon the Discovery, a Numerical Law Regulating the Existence of Every Human Being: Illustrated by a New Theory, Causes Producing Health and Longevity (Classic Reprint) - Hardcover

T. R. Edmonds

9780260604477: Life Tables: Founded Upon the Discovery, a Numerical Law Regulating the Existence of Every Human Being: Illustrated by a New Theory, Causes Producing Health and Longevity (Classic Reprint)

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ISBN 10: 026060447X ISBN 13: 9780260604477

Publisher: Forgotten Books, 2020

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Excerpt from Life Tables: Founded Upon the Discovery, a Numerical Law Regulating the Existence of Every Human Being: Illustrated by a New Theory, Causes Producing Health and Longevity

The above constants of Manhood and Old Age are to be regarded as much nearer approximations to the truth than the constant of Infancy, by reason of the comparative shortness of the period of In fancy, in conjunction with the imperfections of all records of mortality. The existence of the above three remarkable periods of human mortality was long ago pointed out by Dr. Price; but he does not appear to have imagined that the marked distinction was expressible in numbers. There may exist a very small fourth period, between Infancy and Man hood, where the force of mortality is stationary and at its minimum. My assumption of the existence of this period, whether true or false, can be of little or no practical consequence.

If Nature had immovably fixed the limits of the three periods of Infancy, Manhood, and Old Age, the theory would be complete and simple. Such, however, is not the case, either in different populations, or in the same population at different times. An attentive examination has impressed on my mind the belief, that the durations of the Infancy and Manhood periods simultaneously increase or decrease. The defeo tive existing materials may serve to establish this fact, although they do not lead to the knowledge of the precise change in Manhood due toa given change in Infancy. I am inclined to the opinion, that an increase of one year in the duration of Infancy demands, under ordi nary circumstances, an increase of seven years in the duration of Man hood under extraordinary circumstances, I believe that the diminution of either stage may be accompanied by the prolongation of the other. In all the best Tables, the limit of the Infancy period appears to be at the age of nine years, within half a year more or less; and the limit of the period of Manhood at the age of fifty-five, within seven years, more or less.

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