1 487 ] 
Now what farther excites my Curiofity, is, to 
know, whether they will copulate 5 if they do, the 
Wonder will be at its higheft Pitch. As for what 
remains, I have made a Remark, not to be here paired 
over, both upon Earth-worms and Water-inleCts j 
which is, that the pofteriour Parts always appear to 
fuffer more in the Operation than the anteriour. 
We fee the former immediately giving itfelf, as it 
were, convulfive Motions, whilft the latter, almolt 
conftantly, moves about as ufual. 
XIV. I have alfo made Experiments, but without 
Succcfs, on fame forts of terreftrial Millepedes,* like- 
wife on fevcral of thofe kinds of WArms which me- 
tamorphofe themfclves into Tipul'a , or Water-fpiders 5 
but no one of them has fucceeded. 
Thefe are the Obfervations I have begun to make 
upon fo interfiling a Subject. If they are compared 
with what ftill remain to be made, they mud appear 
extremely imperfect; and I myfelf look upon them 
as no other than a rough Sketch of what others may 
poflibly do hereafter. 
Charles Bonnet , 
Geneva , March Correspondent of the Royal 
14. 1742 . N.s. Academy of Sciences at Taris. 
C P. S. I fhould be unpardonable, if I did not en- 
deavour to do all the Juftice to Mr. Tremble/ s 
Obfervations that is due to them. He has excel- 
lently proved, that the aquatic Production, which he 
wrote to me about, is a true Animal, and of the 
Species of the Toly pus , which, belides the furprifmg 
Property of reproducing its Parts, has alfo another 
4 
