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Some Obfervations made on the Spawn of Frogs, and of 
the produBioncf Tod poles therein, by.the Learned 
and Curious Richard Waller, Efq\ Reg.S. Secret. 
A Bout the twelfth of March 1689. I took tome 
x\ Frog-Spawn out of a Ditch, which I fuppofe might 
have been Spawned about 14 days, and kept it in a 
Gally-Pot of Water, which I ihifted every day or two, 
and kept them in a Window, where the Sun (hined fome 
part of the Day. 
At the firft they appeared as Fig. 5, being a round 
black Globule encompaft with a clear Liquor as I after- 
wards found, and a Membrane encompaffing that Liquor, 
and that encompalfed with a larger Sphere of a more 
Mucous Liquor, 
The fecond day that I kept them they appeared as 
Fig, &. The third day as Fig. 6. The fourth day as 
Fig. 7. 
And about the fixth day feveral of them vvereloofed 
from their Eggs, and on the 7th. and 8th, more of them: 
when they appeared of the (hape of Fig. 8. which in 
. Fig. 9. is reprefented bigger than the Life , that the 
pofture they lay in may be feen the better. 
On the 7th. and 8th. days upon pricking of them with 
the point of a Needle they would contract themfclves 5 and 
fome of them on the 8th. day would of themfelves bend 
their bodies, but not move out of their place 3 which 
was the bottom of the Pot they were kept in. 
When they firft got through their Egg (which Ifup- 
pofe they did by eating their way) they hung faft upon 
the outfide of it, by that part which I afterwards found 
to be their Mouth, and when loofed from their hold they 
funk 
