C 248 ] 
been dead many hours ; and the farmer a/Tured me, 
that they always found thefe worms in this diftem- 
per, and knew of no method of cure. 
I fhould have great hopes however, that fumiga- 
tions, either with mercurials, as cinnabar, or with 
fetids, as tobacco, properly ufed, might prove of 
great fervice. 
You have herewith the two fpccies of worms, (See 
Plate VII. Fig.i*) in order to be lodged in the re- 
pofitory of the Society, if it be judged requifite. I 
am. Sir, with the greateft refpedt to you, and the 
Society, 
Lincoln’s-inn-Fields, Your inoU humble fervant, 
Nov. 6, 1 755 - 
Frank. Nicholls. 
XL. Account of fome remarkable InfeEis 
of the Polype kinf found in the Waters 
near Brufiels i7^ Flanders. In a Letter to 
Tliomas Birch, D. D. Secret. R. 'S. from 
T. Brady, M. D. Phyfecian to his Highnefs 
Prince Charles of Lorraine. 
SIR, 
T H E plant, of which I fend you the 
inclofed draught, is found in fum- 
in all forts of ditch or flagnant waters : 
is white, and its tranfparent body, when 
leen with the naked eye, is in length betwixt one 
and 
•Read Nov. 6, 
^ 755 - 
mer-time, 
its colour 
