On Parthenogenesis Or the Successive Production of Procreating Indivduals From
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It seems better there- fore to extend, in like manner, the signification of the term 'larva' to 38 ration'; and affirms that " no true ovary has been discovered in the larval and larviparous Aphides, but that the germs, as soon as they are perceptible, are situated in organs which must be regarded as oviducts and uteri. " (p. 112. ) Accord- ing to my own observations the germs are perceptible in the embryo Aphis, above the simple digestive sac, before any organs have been formed for their recep...tion. And, with regard to the nature of the organs when formed, I may remark that the continuity of the ovarian tubes with the oviducts in all insects is such as to render the negation of the term ( ovary' to those two bodies from which the slender extremities of the eight oviducal and uterine tubes proceed in the larval Aphis, to say the least, quite arbitrary. My examinations agree with those of Siebold, in determining scarcely any appreciable difference between the ovaria of the oviparous and those of the viviparous females.
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To quickly assess the difficulty of the text, read a short excerpt:
It seems better there- fore to extend, in like manner, the signification of the term 'larva' to 38 ration'; and affirms that " no true ovary has been discovered in the larval and larviparous Aphides, but that the germs, as soon as they are perceptible, are situated in organs which must be regarded as oviducts and uteri. " (p. 112. ) Accord- ing to my own observations the germs are perceptible in the embryo Aphis, above the simple digestive sac, before any organs have been formed for their recep...tion. And, with regard to the nature of the organs when formed, I may remark that the continuity of the ovarian tubes with the oviducts in all insects is such as to render the negation of the term ( ovary' to those two bodies from which the slender extremities of the eight oviducal and uterine tubes proceed in the larval Aphis, to say the least, quite arbitrary. My examinations agree with those of Siebold, in determining scarcely any appreciable difference between the ovaria of the oviparous and those of the viviparous females.
What to read after On Parthenogenesis Or the Successive Production of Procreating Indivduals From?
You can find similar books in the "Read Also" column, or choose other free books by Richard Owen to read onlineMoreLess
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