On the Impregnation of the Ovum in the Amphibia First Series Second Ser
On the Impregnation of the Ovum in the Amphibia First Series Second Ser
George Newport
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But having placed several ova in rectified spirit for future examination, at the moment of passing them from the body of a frog, I determined to test the result of the immersion of these in coloured fluid, although well aware of the correct objection that would be made, that the experiment must of necessity be inconclusive. I put some of these into a solution of carmine in water, and watched the result. The envelope, which, while the egg was in spirit, was white, opaque, and adhered closely aro...und the yelk membrane, began to imbibe and expand the instant it was placed in the solution ; and at the expiration of an hour there seemed reason to believe that the trial had succeeded. The envelope was much en- larged, and the fluid had penetrated into it, carrying with it some colouring matter ; as on carefully washing the surface repeatedly in clean water, to remove the deposit on the exterior, the substance of the interior was seen to be coloured, and it was evi- dent that the colouring matter had penetrated as fay as the deepest or thick layer of the envelope.
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