%58 ANIMALS KILLED IV. 
very much refembles the fubftance I have defcrib- 
ed: but-he never had the fatisfaction to fee one 
excluded: nor has he feen a wheel animal come 
from the gelatinous eggs, though he kept them 
three years. 
_ The learned Abbate Roffredi has enjoyed the 
good fortune denied te Baker and me, and put 
the finifhing ftroke to eur obfervations. In- 
cidentally {peaking of the wheel animal in Ro- 
zier’s Fournal, he fays, in exprefs terms, he has 
feen it delivered of an-egg, and an animal pro- 
ceed from the egg. ‘ Leeuwenhoeck is miftaken 
“in thinking the wheel animal viviparous; and 
“ what he fuppofed excrements in the inteftines is 
€ really an egg, which I have feen it produce, and 
© often continued to obferve until it was hatched.” 
if Roffredi’s obfervation is correct, which, in- 
deed, cannot be doubted, a fact in the hiftory of 
the wheel animal is elucidated which fheuld deep- 
ly intereft the naturalift. 
The folution of this problem, added to my ob- 
fervations, difcovers another important truth, 
mamely, that wheel animals undergo no meta- 
morphofis. I have collected many minute ones 
produced in a watch-glafs. They always conti- 
nued growing; but when killed and revived 
their increment was flow; and quick, on the con- 
trary, when they were kept continually wet. 
When full grown, each generally laid an egg, 
which . 
