[ 453 3 
naked eye, l obferved that the fore-part of the body of 
it was fqueezed by a narrowncfs, wherefore I did ima- 
gine that the Heart of the Animal was fo oppreflTedj. 
that it could not perform the operation, that doth be- 
long to it, in forcing out the Blood, , and receiving it 
again. 
While I was confidering of this, the little Animal 
made a very ftrong motion, beating his tail about, 
and bending his body, by. which it got its body clear 
out of the ftreight wherein it was before 5 and when 
it was thus free and clear, I began to view it again, 
and immediately I perceived that the Blood began to 
have a finall motion, and impulfe again in fcyeral 
Veflels, whiclidid increafe from time to time, fo that 
the Blood came quite to its motion, yet not with fucli 
a fwiftnefs, as it would have had, if the Body "or the 
Heart had not been hindred. 
The motion of the Blood in thefe Tadpoles exceeds- 
all the reft of fmall Animals, and Fi(h, I have feen 5 ; 
my, this pleafure has oftentimes been fo recreating to 
me, that I do not believe that all the pleafure of Foun* 
tains or Waterrworks, either natural or made by Art^ 
could have pleafed my fight fo well, as the view of 
thefe Creatures have given me. 
Fig. 5, reprefents the Tadpoie of a Frog, that is 
G^me to fuch a bignefs, that he could make ufe of 
both his legs, and the tore legsof them were alfo diP- 
cernible, but yet covered with the skin» 
Thefe animals are known by the vulgar fort of peo*^ 
pie by the name of Thandcr-pads, becaufe they- ima^ 
gine that they are derived or procreated from 'Thur>- - 
der; 
I; have often confidered^ whether the name, of Thunh 
dei^pads has not beea thus derived. 
» ^/^^hea^ k thunde and rains,, in the timei when^hc ; 
'^dgoles are provided with kgs^ they come great. 
