. The physiology of reproduction. Reproduction. PHASES IN THE LIFE OF THE INDIVIDUAL 669 five years of age ; girls at twenty or twenty-one. In both sexes the weight of the body tends to increase until about the fiftieth year or somewhat later, owing to an accumulation of fat, but there are of course very many exceptions.^ That good nourishment and a healthy environment favour growth is a fact recognised by all. So also systematic exercise has been found to increase both the weight and the height,^ and it has been shown further that well - developed children are more mentally and tak
. The physiology of reproduction. Reproduction. PHASES IN THE LIFE OF THE INDIVIDUAL 669 five years of age ; girls at twenty or twenty-one. In both sexes the weight of the body tends to increase until about the fiftieth year or somewhat later, owing to an accumulation of fat, but there are of course very many exceptions.^ That good nourishment and a healthy environment favour growth is a fact recognised by all. So also systematic exercise has been found to increase both the weight and the height,^ and it has been shown further that well - developed children are more mentally and take better places at school than ill-developed and badly-nourished ones.*. 03ie 131822283336 46 Sfi 66 7' 90 Fig. 147.—(From Minot's Problem of Age, Qrowth, and Death, G. S. Putnam k Sons, and John Murray.) In horses and other domestic animals the efiects of feeding on growth and general development are remarkable. Thus it is said that a highly-fed thoroughbred at two years old is " furnished " and looks as old as an ordinary horse at four years old.* ^ See Minot, Popular Science Monthly, vol. Ixxi., 1907. Minot states that his calculations are based on data supplied by Professor Donaldson. See also Lee, Article "Reproduction," in Howell's American Text-Book of Physiology, 2nd Edition, London, 1900. ^ Beyer, "The Influence of Exercise upon Growth," Jour, of Exper. Medicine, vol. i., 1896. ' Porter, " The Physical Basis of Precocity and Dulness," Trans. Acad, of Science, St. Louis, vol. vi., 1893. * Smith, loc. 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 Marshall, F. H. A. (Francis Hugh Adam), 1878-1949; Cramer, William, 1878-1945; Lochhead, James. London, New York, Longmans, Green
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