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POPULAR SCIENCE REVIEW. 
The worm coming out of the mouth of the polype, forces it to enlarge itself 
considerably, especially if it emerges doubled up. . . . When the polype is 
in this state, I take it gently, without disturbing anything, out of the water, 
and place it on the edge of my hand, which is simply moistened, so that it 
may not adhere too closely. I oblige it to contract more and more, and this 
also enlarges the stomach and mouth. One must remember here that the 
worm is partly emerging from the mouth, and keeping it open. I take then 
with the right hand a hog’s bristle, rather thick and without a point, and I 
hold it as one holds a lancet for bleeding. I bring its thickest end to the 
posterior extremity of the polype ; I push this extremity, and make it enter 
into its stomach, which is done the more easily as it is empty in that part, and 
very much enlarged. I then go on advancing the end of the hog’s bristle, 
which, as it is pushed forward, continues to invert the polype. When it 
reaches the worm which holds the mouth open, it either pushes the worm or 
passes by its side, and at last comes out by the mouth, covered with the 
posterior part of the polype. It is easy not to miss the mouth, because it is 
very open. It happens sometimes that the polype is at once completely 
inverted. It must be understood that it then covers the end of the hog’s 
bristle, which is lodged inside the inverted polype ; that the exterior surface 
of the animal is become the interior ; that this surface touches that of the 
hog’s bristle ; and that the interior has become the exterior. 
Trembley tlien goes on to say that he took steps to prevent 
the polypes from turning themselves back to their original 
condition, as they attempted to do, often with success, and 
found that they lived, “ ate, grew, and multiplied.” He 
turned some inside out which had little ones attached to their 
bodies, and these young ones, after the operation, found 
themselves in the interior of the polype. “If they were 
tolerably advanced, and the place where they joined on to the 
mother was considerably constricted, they became detached 
in a short time, about the end of a day or two ; but mean- 
while they extended themselves in the stomach of their 
inverted mother, and their heads and part of their bodies 
might be seen emerging from her mouth. . . . But with 
those less advanced, which have no arms or only very short 
ones, and whose posterior ends are not yet restricted, the case 
is different. The opening which communicates between the 
stomach of these little ones and that of the mother is still its 
full size. When the mother is turned, the little one can invert 
itself also. It is just the same as if, after having turned a 
glove, the fingers of the glove were to turn themselves inside 
out. By looking attentively at the body of the mother after 
having been turned inside out, one sees in the place of these 
young ones a hollow, which gradually fills, after which is 
to be easily distinguished the body of the young polype 
turning itself as it comes out. ... In a few minutes the 
little polype, will be completely inverted. Then it continues to 
