Ml CROSCOPICAL 



Essays. 



oefophagus b c, to the fecond fwelling, has no motion. There is 

 a variety in the motions of the firft part of this duel:, fometime^s < 

 k dilates and contracts, at. other times it has an ofcillatory motion,. 

 It is difficult to gain a good view of the appendages, but when 

 the petition of the little . creature is favorable, they feem to have 

 a two-fold motion, by which the pointed ends approach to, and 

 thenfeparate from .each other, and another by which they move 

 up and down. The part g k 1 moves backwards and forwards 

 alternately, the motion of each of thefe parts is independent of 

 the reft. Thefe are the principal parts, whofe motion is connect- 

 ed with the life of the animal. 



The other vifcera "that are contained in the body of the eel, 

 and which may be obferyed by the aid of the microfcope, are the 

 vefic-Is which contain the food, thofe which are filled with a trans- 

 parent fubftance, and the womb, or ovary. The firft form the 

 abdomen and interlines ; thefe are filled with a black fubftance, 

 which prevents their being properly and clearly diftinguifhed ; 

 thefe veffels, in their paifage through the pofterior part of the 

 body, form an empty fpace, in which we may perceive that one 

 fide of the animalculum is occupied by the ovary q qq, which 

 runs from j to tix ; it -is at thefe two extremities of the ovaries 

 that the eggs begin to be formed, for the large II eggs are always 

 to be found in the middle, and the fm all eft at the ends, as may 

 be feen at j f and u x. 



All the eels which bear eggs have two protuberances, y y, 

 .- formed on the exterior part, near the center of the ovary ; it ap- 

 pears like a tranfparent femicircular membrane, but is really a 

 kind of hernia, or bag, in which one or two eggs may be fome- 



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