Volume 2

Dissertations relative to the natural history of animals and vegetables / Translated from the Italian of the Abbé Spallanzani.

  • Spallanzani, Lazzaro, 1729-1799.
Date:
1789
Catalogue details

Licence: Public Domain Mark

Credit: Dissertations relative to the natural history of animals and vegetables / Translated from the Italian of the Abbé Spallanzani. Source: Wellcome Collection.

    36/528 (page 28)
    {phere is divided, they may be removed with- out injury to the young animal. xxxvil. The part really neceflary to this animal, and of which the removal is fatal, is the amnion, within the liquor of which it at firft floats (xxvilI, xxx1). As Roefel does not mention the amnion, it muft have been unknown to him; and although this membrane is found in every fpecies of frog and toad, not the leaft mention is made of it in his hiftory; this circumftance the more furprized me, fince it did not efcape the diligence of Swammerdam, in whofe footfteps. the German naturalift profefles to tread. xxxviil1. He has, however, remarked ' “an accident, which happens to tadpoles that die in the amnion, or as he expreffes it to eggs, that are not prolific: they become fometimes pointed, fometimes pear-fhaped, fometimes oblong, and at others narrow in the middle, and fo on. Four fuch tadpoles are reprefented in Fig. 5.at ABCD. xxxIx. The tadpoles of. this Pata re~ quire great attention. They mutt be kept, not merely in clean water, but in that which is taken from the places where the males and females meet, as from ditches and