The Evolution of Man — volume 1
The Evolution of Man — volume 1
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I first advanced this fundamental principle in my essay On theGastrulation of Mammals (1877), and sought to show in this way that Iassumed a gradual degeneration of the food-yelk and the yelk-sac onthe way from the proreptiles to the mammals. "The cenogenetic processof adaptation, " I said, "which has occasioned the atrophy of therudimentary yelk-sac of the mammal, is perfectly clear. It is due tothe fact that the young of the mammal, whose ancestors were certainlyoviparous, now remain a long t...ime in the womb. As the great store offood-yelk, which the oviparous ancestors gave to the egg, becamesuperfluous in their descendants owing to the long carrying in thewomb, and the maternal blood in the wall of the uterus made itself thechief source of nourishment, the now useless yelk-sac was bound toatrophy by embryonic adaptation. " My opinion met with little approval at the time; it was vehementlyattacked by Kolliker, Hensen, and His in particular. However, it hasbeen gradually accepted, and has recently been firmly established by alarge number of excellent studies of mammal gastrulation, especiallyby Edward Van Beneden's studies of the rabbit and bat, Selenka's onthe marsupials and rodents, Heape's and Lieberkuhn's on the mole, Kupffer and Keibel's on the rodents, Bonnet's on the ruminants, etc.
What to read after The Evolution of Man — volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Haeckel, Ernst Heinrich Philipp August, 1834-1919 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
I first advanced this fundamental principle in my essay On theGastrulation of Mammals (1877), and sought to show in this way that Iassumed a gradual degeneration of the food-yelk and the yelk-sac onthe way from the proreptiles to the mammals. "The cenogenetic processof adaptation, " I said, "which has occasioned the atrophy of therudimentary yelk-sac of the mammal, is perfectly clear. It is due tothe fact that the young of the mammal, whose ancestors were certainlyoviparous, now remain a long t...ime in the womb. As the great store offood-yelk, which the oviparous ancestors gave to the egg, becamesuperfluous in their descendants owing to the long carrying in thewomb, and the maternal blood in the wall of the uterus made itself thechief source of nourishment, the now useless yelk-sac was bound toatrophy by embryonic adaptation. " My opinion met with little approval at the time; it was vehementlyattacked by Kolliker, Hensen, and His in particular. However, it hasbeen gradually accepted, and has recently been firmly established by alarge number of excellent studies of mammal gastrulation, especiallyby Edward Van Beneden's studies of the rabbit and bat, Selenka's onthe marsupials and rodents, Heape's and Lieberkuhn's on the mole, Kupffer and Keibel's on the rodents, Bonnet's on the ruminants, etc.
What to read after The Evolution of Man — volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Haeckel, Ernst Heinrich Philipp August, 1834-1919 to read onlineMoreLess
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