Excerpt from The Edinburgh Medical and Surgical Journal, 1832, Vol. 37: Exhibiting a Concise View of the Latest and Most Important Discoveries in Medicine, Surgery, and Pharmacy
The fecundity of mankind is then obviously independent of that periodical instinct which regulates the fecundity of qua drupeds. But here an important, and, as far as I know, a novel question presents itself; namely, thatsince the duration of he. Manpmgnancyieonlyninemonthsfiheeameas in thecow and the deer, how does it happen that women do not conceive and bring forth annually as well as they? It is clear that there must be some law in operation which prevents this result, since it is well knownthat the ordinary interval between me oessive births in the same mothers, when the children live to be suckled, is about two years. This interval, be it a little more or less, coupled with the fact of human pregnancy continuing only nirie months, shows that the fecundity of women is by some means restrained, or rather regulated, with something of the same general certainty that happens in brutes from instimt.
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