The Evolution of Sex
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In our eReader you can find the full English version of the book. Read The Evolution of Sex Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Evolution of Sex
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'''' L)e Graaf attempted in vain to give more precision to this "contagion" in his theory of an '■'■ au?'a seminalis, ^^ or seminal breath which passed from the male fluid to the ovum. But the conception of an "aura " was only a verbal cloak for that absence of definite knowledge which the slow progress of observation still necessitated. The theory was partly strengthened by a number of erroneous obser- vations, which seemed to show that successful fertilisation could occur when the genital pas...sages of the female were apparently blocked by malformation or disease. Spallanzani gave a death- blow to the theory of an "aura, " by showing ex})erimentally THEORY OF FERTILISAIION. 159 that contact of the male fluid with the ovum was absolutely necessary. Even he, however, went away h'om the true con- clusion, by maintaining that the fertile male fluid of toads was destitute of spermatozoa. That the above vague conceptions have been replaced by the certain conclusion, that intimate cellular union is the sine qua nou of fertilisation, we have already emphasised.
What to read after The Evolution of Sex?
You can find similar books in the "Read Also" column, or choose other free books by Geddes Patrick to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
'''' L)e Graaf attempted in vain to give more precision to this "contagion" in his theory of an '■'■ au?'a seminalis, ^^ or seminal breath which passed from the male fluid to the ovum. But the conception of an "aura " was only a verbal cloak for that absence of definite knowledge which the slow progress of observation still necessitated. The theory was partly strengthened by a number of erroneous obser- vations, which seemed to show that successful fertilisation could occur when the genital pas...sages of the female were apparently blocked by malformation or disease. Spallanzani gave a death- blow to the theory of an "aura, " by showing ex})erimentally THEORY OF FERTILISAIION. 159 that contact of the male fluid with the ovum was absolutely necessary. Even he, however, went away h'om the true con- clusion, by maintaining that the fertile male fluid of toads was destitute of spermatozoa. That the above vague conceptions have been replaced by the certain conclusion, that intimate cellular union is the sine qua nou of fertilisation, we have already emphasised.
What to read after The Evolution of Sex?
You can find similar books in the "Read Also" column, or choose other free books by Geddes Patrick to read onlineMoreLess
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