Martin Folkcs, Efq\ 7 



March^ though the Weather was then ex- 

 ceffively cold, and continued fo to the End 

 of April, And I have gone on till this very 

 Day repeating moft of them feveral Times 

 over, without finding any confiderable Dif- 

 ference, but that of a much quicker Growth 

 and Separation of the Parts cut to Pieces as 

 the Weather became warmer. A Difference 

 not fufficiently important to render more than 

 one Experiment of a kind neceffary to be laid 

 before the Publick. Though it may not be 

 improper to remark, that what by Divifions, 

 Subdivifions, and the Creature's natural In-^ 

 creafe, feveral hundreds have been produced 

 by my firft three, between March the twen- 

 ty fifth, and the prefent fourth Day oi Augufi, 



Thefe, however, were not all the Poly- 

 pes I have had under my daily Care and In- 

 fpe<3:ion : for on the eighth oi Aprils Mr. El- 

 LicoTT, F.R. S. gave me fix Englifo Ones, 

 taken in a Pond at Hackney j and they, fince 

 that time, have I believe produced me no 

 fewer than your Dutch Ones did. From 

 him I received, likewife, on the nineteenth 

 oiMay^ feven or eight green Ones, that were 

 found in Effex-, which have alfo increafed 

 confiderably. And, in July laft, you fa- 

 voured me farther with fome of the long- 

 arm'd Sort, juft then arrived from Monf. 

 Trembley. 



I fliall, by and by, more particularly de- 

 fcribe thefe four different Species of Polypes, 

 B 4 and 



