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In the Cosmaricty we find in each half of the 

 animalcule (fig. 18. and 19.) a bladder in the axe 

 (d.) , and two other lateral ones (c. c.) of a darker 

 colour, containing innumerable molecules, constantly 

 turning and moving. I said above that the Cosmaria 

 were to be considered as double animalcules, united 

 during their whole life. In the Cosmarium dello'ides 

 (fig. 18 19.) I have seen both halves of the ani- 

 malcule, separated during whole days , and two blad- 

 ders, perfectly transparent and colourless, unloading 

 in one another , and developing themselves. The 

 bladders, where the contact took place, were visibly 

 perforated. Soon after the developement of these 

 bladders , I have seen the mass of the dark mole- 

 cules of the bladder (d.) evacuated into the trans- 

 parent one, in consequence of which a double stream 

 of molecules (fig. 19. a. and b.) took place, crossing 

 itself in the common opening, so that the molecules 

 of the one ran into the bladder of the other animal- 

 cule, or part of it. 



The Cosmarium bipes (fig. 20.) offers another 

 instance of this exchange of a molecular fluid. We 

 see here several animalcules under the form of 

 a chain , united by obtuse points. Soon after this 

 union, two other united animalcules open themselves 

 by a long fissure (f.) , and we see two streams of 

 free molecules (fig. 2(h a. g.) moving in the direction 

 indicated by arrows, and operating in this manner 

 the exchange of fluids. 



