Of the frejh Water Polype. 26 1 
He likewife cut another, in part length-wife, beginning 
at the head, which became a polype with two bodies, 
two heads **, and but one tail. After having nourifhed 
this two headed polype, by feeding it at both mouths 
he alfo fplit thefe heads, and in a little time it had four, 
and at laft by cutting it after the fame manner, it had 
feven heads, fig. 405. 
If a polype be cut in part length-wife, beginning at 
the tail, it will foon have one head and two tails ; and 
in this manner the number of heads and tails may be 
augmented by cutting almoft ad infinitum. 
As all forts of thefe frefh water polypes form only a 
tube or gut, proceeding from one of its extremities to 
the other, they may be turned infide out as one would 
turn a fack, viz. give a worm to the polype you would 
perform this experiment upon, and when it is fwallowed, 
put the polype into a concave glafs, or into the hollow 
of the object-carrying glafs, with a little water ; after¬ 
wards prefs it near the tail with an hair pencil, ftroking 
it towards the polype’s mouth, that the worm within its 
ftomach may be forced partly out, as at c e, fig. 412. 
its hinder part a, remaining empty. As the worm goes 
out, the ftomach enlarges prodigioufly, efpecially if it 
goes out double, as is exprefied in the figure. When 
the polype is in this ftate, make it contract as much as 
poftible, which contributes much to the enlargement of 
the ftomach. It muft be here obferved, that as the worm is 
partly out of the ftomach it keeps it open, then taking an 
hog’s briftle in the right hand, pufh it againft the extremity 
of the tail b, till it enters into the ftomach, continuing 
gradually to advance the hog’s briftle, till it hath quite 
turned the polype. When it comes to the worm which 
keeps the ftomach and mouth open, it either pufhes that 
out, or paftes by on one fide thereof? and at laft goes out 
of 
