. The physiology of reproduction. Reproduction. 678 THE PHYSIOLOGY OF REPRODUCTION 94, 96, and even 103 in whose semen active sperms were found.^ There can be no doubt, however, that the spermatozoa are produced in far less abundance in old age. In women the period of senescence is usually reckoned from the menopause. It is difficult to form any accurate comparison between the phases of life of men and those of animals, partly because so. Fig. 152.—Group of nerve cells from the first cervical ganglion of a man of ninety-two. (After Hodge, from Minot's Age, Growth, and Death, G. S. Putnam &
. The physiology of reproduction. Reproduction. 678 THE PHYSIOLOGY OF REPRODUCTION 94, 96, and even 103 in whose semen active sperms were found.^ There can be no doubt, however, that the spermatozoa are produced in far less abundance in old age. In women the period of senescence is usually reckoned from the menopause. It is difficult to form any accurate comparison between the phases of life of men and those of animals, partly because so. Fig. 152.—Group of nerve cells from the first cervical ganglion of a man of ninety-two. (After Hodge, from Minot's Age, Growth, and Death, G. S. Putnam & Sons, and John Murray.) C, C, cells still intact, but shrunken and loaded with pigment; c, c, cells which have disintegrated. little is known regarding the conditions of natural senescence and death in animals. Smith ^ remarks that few horses live long enough to show much sign of arterial degeneration ; the work they perform is the chief cause of their rapid decay, for their legs wear out before their bodies : but, apart from this, degenerative changes in the teeth, and more particularly the wearing away of the molars, prevent many horses from reaching ' Cooper, The Sexual Diaahililiis of Man, &c., London, 1908. '' 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreproduction, bookyea
