On Parthenogenesis Or the Successive Production of Procreating Indivduals From
The book On Parthenogenesis Or the Successive Production of Procreating Indivduals From was written by author Richard Owen Here you can read free online of On Parthenogenesis Or the Successive Production of Procreating Indivduals From book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is On Parthenogenesis Or the Successive Production of Procreating Indivduals From a good or bad book?
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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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