- ( 230 ) 



Plate XVII. fg. 20, rep relents the egg of the Frog I am now 

 defcribing, incloled in the tenacious or vifcid fubftance I have 

 mentioned ; and when it is lb far grown, that the animal begins to 

 move, the tail appears fome\\hat bent. Fig. 21, reprefents the 

 animal, when fo fully formed in the egg, as to be able to fwim 

 in the water ; this was taken by me out of the egg, and laid on a 

 glafs, where it died, and the body of it dried up. 



Fig. 22, A B C D E F, reprefents the fame animal as it appeared 

 to the limner through the microfcope, in which the head can 

 ealily be diftinguilhed from the fore part of the body, as is repre- 

 fented at A B F. 



FE is the belly of the animal, which was of a yellowilh colour, 

 being formed, as I have laid, out of that part of the egg, where 

 there remained a yellow fpot ; but this drawing is not exacftly like 

 the animal, becaufe it was fo broken and torn, that it only exhibited 

 the appearance of globules. 



C 1) E reprefents the tail of the animal, in which a fpine or back 

 bone could very plainly be diliinguifhed, and is here rcprefented in 

 the figure in the beft manner the limner was able; and though I 

 opened many of the tails of thofe animals, which had this appear- 

 ance of a fpine, I could not difcover in them any other parts than 

 globules. 



Thele little animals, or Tadpoles, in fwimming, move their tails 

 with great force, and as foon as they ceafe the motion, they link 

 to the bottom of the water, whence it appears that their bodies are 

 fpecifically heavier than water. But thefe animals have a property 

 (while in their Tadpole Hate) to fix their heads to the glafs, fo that 

 they are able to faftcn themfelves to any thing they find in the wa- 

 ters, and there to remain without finking to the bottom. 



Moreover, I placed a Tadpole, which was alive in the water and 

 liad fixed itfelf to the glafs, before a microfcope, direding the limner 

 to make a drawing of it as it appeared to him. 



F/^. 23, G H I K L M N O P Q R S, reprefents this Tadpole alive, 



