( ^31 ^ 



as it had fixed itfelf to the glafs, with its belly next the eye of the 

 fpeAator ; this Tadpole had but a few hours before quitted the egg 

 and jelly in which it had been inclofed. 



L M NOP, reprefents the head ; H IRS, the belly ; and G H S, 

 the tail. In the upper part of the head of this animal, its Ikin ap- 

 peared fomewhat thicker than the reft ; fo that I concluded, this was 

 a part of the Ikin which in time would cover the whole body of the 

 animal : this is reprefented at M NO. The mouth is ihewn atT, 

 which I did not perceive this newly hatched animal to move. At 

 V V are two dark fpots in the animal's head, of a veiy round Ihape, 

 and being much more protuberant than I have feen in any other ani- 

 mal, and which many would conclude to be the eyes. But if eyes,, 

 they would not be feen by us in this pofition of the animal ; but ra- 

 ther be placed on the otlier fide out of fight. 



I K L, and P Q R, are fix tranfparent parts hanging down from 

 the head, three on each fide, and thefe parts were the only reafon 

 of my giving a drawing of this Tadpole ; for in each of them I, with 

 great delight, faw moflidifiindly the circulation of the blood, which 

 was driven from the parts next the body to the extremities, and 

 there, with great fvviftnefs, performed an incefiant circuit back to the 

 body. This circulation had not an equable or even motion, but 

 was performed at intervals by quick repeated protrufions ; and in the 

 intervals, any one for the moment, would have thought the circu- 

 lation cealed ; but fcarcely had the current of the blood begun to 

 make a fl;op, when a new protrufion immediately followed, caufing 

 a continual courfe of the blood in this creature; and, upon accurately 

 computing the time in which their pulfations or protrufions were per- 

 formed, I may fay, that an hundred of them \^ ere performed in lefs 

 time than one could count an hundred. From thefe appearances, I 

 concluded that at every one of thofe protrufions, the blood was 

 driven out of the heart, and I could perceive this motion (namely, 

 the protrufion of the blood from the heart, and its paflage from the 



