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regularity in the fame fpecies of thefe corallines, as 
xvhen we compare two oak trees to one another, or 
two of Mr. Trembley’s branched frefh- water polypes 
to one another. 
He then proceeds to his fifth argument. That if 
corallines were formed by polypes, neither the po- 
lypes, nor even their cells, would ever fix on living 
animals, or any other bodies. 
Here we may obferve, that the confequence he 
draws doth not follow : for corallines may be formed 
or produced by certain fpecies of polypes, and yet 
polypes of another fpecies may be found adhering to 
other bodies, and even to animal bodies. 
By his fixth argument he endeavours to prove, 
That the veficles, which are found in regular rows 
on the fea-fir coralline in winter. Tab. VIII. fig. 6. 
do not belong to it j and are no more than the eggs 
of fome fea infedt depofited on it, of which there 
may be a great variety. 
But to convince him of his miflake, let him take 
off one of the veficles, and apply a large magnifier 
to the place, and he will difcover a hole, by which 
this veficle or ovary has had a communication thro’ the 
fkin with the parent polype. For a further illuftra- 
tion of the manner in which thefe veficulated polypes 
breed, let him confult the 38th Plate of my Effay, 
where he will find feveral accurate figures (drawn by 
Mr. Ehret from the life) of thefe veficles, with the 
fpawn of the polypes coming out of them j fome of 
which fpawn we evidently difcovered to be young 
polypes with their arms formed ; and, as they fell 
from the veficle, extending themfelves in the watch- 
glafs of fea-water* 
