Of the frejh Water Polype. 16y 
felves to the light fide of the glafs, the dark fide being 
quite depopulated. 
For Mr. Trembley inclofed a great glafs well ftored 
with green polypes, in a pafte-board box, which had a 
hole cut on one fide in the form of a chevron, that ex¬ 
actly anfwered to the middle of the glafs in- which'the 
polypes were : when this hole was turned to the light, it 
always happened, that the polypes afiembled themfelves 
together at that fide of the glafs, and alfo in the form of 
the chevron; although the glafs was turned feveral times 
in this box, yet at the end of a few days the polypes 
were always found ranged as before. To vary this ex¬ 
periment, he turned the chevron upfide-down, and not- 
withftanding this, the polypes always afiembled them¬ 
felves together, and in the form of the chevron, whether 
right or inverted. 
The twenty-fifth of November 1740, Mr. Trembley 
cut a polype tranfverfly (for the firft time) but the head 
part a little fhorter than the tail parr, and put the two 
parts into a flat glafs, in which the height of the water 
did not exceed a quarter of an inch, by which means 
they might be eafily obferved with a pretty deep magni¬ 
fying glafs. 
In that inftant the polype was cut, both parts con¬ 
tracted, and funk to the bottom of the glafs, like two 
little grains of green matter. Some few hours after both 
the parts ftretched themfelves out, and were eafily to be 
diftinguifhed from each other, the anterior end of the 
frit being furnifhed with horns, whereas the other had 
none at all. 
ft he firft part moved its arms, and the next day he 
faw it change its place in the glafs, and both were ob- 
ierv ed to extend and contract themfelves for feveral 
days, 
M 4 
He 
