Volume 2

Dissertations relative to the natural history of animals and vegetables / Translated from the Italian of the Abbe Spallanzani ... To which are added two letters from Mr. Bonnet to the author.

  • Spallanzani, Lazzaro, 1729-1799.
Date:
1784
Catalogue details

Licence: Public Domain Mark

Credit: Dissertations relative to the natural history of animals and vegetables / Translated from the Italian of the Abbe Spallanzani ... To which are added two letters from Mr. Bonnet to the author. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

    145/428 (page 137)
    prize ? I reply, with great confidence, that the mixture took place in the firfi: of thele ways, and never in the fecond. When I dropped thefe different liquors into the feed, I was careful to obferve what changes hap- pened, and that I might be better enabled to judge I ufed the microfcope. The mixture feemed always to be attended with a real in- corporation of the two fluids. When water was ufed, it appeared as limpid and homoge- neous as if it had been water alone. When the feed was mixed with black vinegar, the mixture had a blackifh colour, and when with white vinegar, it was fomewhat lefs opake. In both cafes the acid loft fomewhat of its fournefs, a certain proof that the femi- nal fluid, which of itfelfis infipid, had been diffufed through the whole of the vinegar. The fame thing took place when urine was tried. The juice of the tefticles after being mix- ed with the fame fluids, loft nothing of its efficacy. And as it tinged thefe fluids with its own colour, it was reafonable to infer that it was incorporated with them as well as the feed. It appears therefore, that both thefe prolific liquors preferve their qualities fome time after the death of the animal, both when pure, and when by being mixed among other matters they have fullained a confiderable di- vifion of their integrant parts. But I fhall fpeak more particularly concerning fecunda- tion after a great, nay, almofi: infinite fepa- ration of the particles. CXXXV. I now come to defcribe the va- rious changes I have endeavoured to effedt on tadpoles before fecundation, which was the other