On the impregnation of the ovum in the Amphibia: (Second series, revised.) And on the direct agency of the spermatozoon. (From the Philosoph. Transactions. P. II for 1853.) |
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Page 234
... obtained and so mixed . Nearly the whole of the observations I have since made have coincided with these results . Yet there have been two marked instances in which fecundation was effected by fluid , which had been obtained , and * Loc ...
... obtained and so mixed . Nearly the whole of the observations I have since made have coincided with these results . Yet there have been two marked instances in which fecundation was effected by fluid , which had been obtained , and * Loc ...
Page 235
... obtained when the temperature of the atmosphere was 51 ° FAHR . , and afterwards sunk to 49 ° FAHR . , but had again risen to 51 ° FAHR . at the time of the experiment . When examined with the microscope , immediately before it was used ...
... obtained when the temperature of the atmosphere was 51 ° FAHR . , and afterwards sunk to 49 ° FAHR . , but had again risen to 51 ° FAHR . at the time of the experiment . When examined with the microscope , immediately before it was used ...
Page 236
... obtained , as they state , by vivisection , and was expressed from the testes , and necessarily must have been in great part immature , and contained many spermatozoal cells , from which the fecundatory agents were liberated at dif ...
... obtained , as they state , by vivisection , and was expressed from the testes , and necessarily must have been in great part immature , and contained many spermatozoal cells , from which the fecundatory agents were liberated at dif ...
Page 237
... obtained with the greatest ease , in full quantity of a white and somewhat opake colour . When examined with the microscope it was found to consist in chief part of developmental cells , containing each its motionless immature ...
... obtained with the greatest ease , in full quantity of a white and somewhat opake colour . When examined with the microscope it was found to consist in chief part of developmental cells , containing each its motionless immature ...
Page 240
... obtained from their natural haunts only three hours before the female was killed , by division of the spinal cord , for the purpose of the experiments . No. 1. Eighty - six eggs passed from the Frog at one hour and a half after death ...
... obtained from their natural haunts only three hours before the female was killed , by division of the spinal cord , for the purpose of the experiments . No. 1. Eighty - six eggs passed from the Frog at one hour and a half after death ...
Other editions - View all
On the Impregnation of the Ovum in the Amphibia: (Second Series, Revised ... Ge Newport No preview available - 2015 |
On the Impregnation of the Ovum in the Amphibia ... (First Series ... Second ... George Newport No preview available - 2016 |
Common terms and phrases
abundance act of fecundation aëration Amphibia appeared applied artificial impregnation beneath the microscope Busk chamber was formed chloroform circumstances diffluence effected efferential ducts eggs were passed embryos were produced endosmic action endosmosis envelopes fact FAHR fecundated egg fecundatory agent fecundatory influence female fluid employed four hours GEORGE NEWPORT germinal vesicle glass cell imbibition instance liquor seminis male mature mixed with water motionless narcotized number of spermatozoa observations obtained ovary oviduct oviposition ovum penetration Philosophical Transactions pin point pin-head power of motion PREVOST and DUMAS produced an embryo produced embryos quantity of spermatozoa quantity of water remained respiratory chamber Sciences Nat season seemed segmentation commenced Semen seminal fluid separate cells solution of potass SPALLANZANI spermatic bodies spermatic fluid spermatozoal cells substance supplied surrounding medium tion Toad touched once tozoon Triton triturated underwent segmentation vesiculæ seminales vitality vitellary membrane vitelline membrane WAGNER and LEUCKARDT white surface yelk