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On the Impregnation of the Ovum in the Amphibia: (Second Series, Revised ...
No preview available - 2015
abundance act of fecundation Amphibia appeared applied artificial impregnation become beneath the microscope Busk chamber was formed chloroform circumstances diffluence effected efferential ducts embryo was produced embryos were produced endosmic action endosmosis envelopes fact Fahr fecundated egg fecundatory agent fecundatory fluid fecundatory influence female fluid employed four hours GEORGE NEWPORT germinal vesicle glass cell greater number imbibition immersed in water instance male mature mixed with water motionless narcotized number of spermatozoa observations obtained ovary oviduct oviposition ovum partially fecundated penetration Philosophical Transactions pin-head pin-point 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 spermatic bodies spermatic fluid spermatozoal cells substance supplied surrounding medium tion Toad touched once tozoon Triton triturated underwent segmentation vitality vitellary membrane vitelline membrane white surface yelk