qg6 Of the frejh tVater Polype . 
420. is the turned part, and a d one of the heads, n g r 
ne, fig. 421. the two other heads. 
Mr. Trembley imagined, that if one polype could be 
put in the ftornach of another, in fuch a manner, that the 
external fuperficies of the fkin of the firft, fhould be ap¬ 
plied to the internal fuperficies of the fkin- of the fecond, 
they might flick together, and become but one polype. 
To introduce one polype into another, firft feed fome 
of them, and when they are fwelledby the aliments, their 
mouths will be alfo extended. Take that polype out 
of the water, you would introduce into the ftornach of 
another, and put it upon your left hand, making it con- 
trad!: as much as poftible by ftroking it with an hair pen¬ 
cil, in fuch a manner as to force the aliments out of its. 
ftomach, and thereby caufe its mouth to open; then 
taking a hog’s brittle in the right hand, put the biggeft- 
end thereof into the polype’s mouth, and t'hruft it to the 
bottom of its ftornach. When this is done, place the 
polype upon your hand, into which this is to be intro¬ 
duced, caufing it to open its mouth, as in the other po¬ 
lype, and thruft that which is upon the hog’s brittle, into 
the ftornach thereof, and dip it into a glafs of clean water, 
that you may examine it with a magnifying glafs ^ then 
to prevent the inner polype from extricating itfelf, fpit 
them both together upon an hog’s brittle. 
Fig. 422. reprefents two polypes put one into the 
other, a b the exterior polype, and c a, b d, the interior 
one • e f in all the figures {hews the hog’s brittle which 
run through both the polypes at e. 
Fig. 423. is the fame polype, a i b the exterior one, 
c a i d the interior one ; the part i d by bending having 
ript up the part i b of the exterior polype, and by this 
means got out. 
Fj O'. 
