514 . Microscopical Essays/ 



from whence it is prolonged in the form of a black line m n n,. 

 which pafles by the axis of the duft eeh, and apparently ter- 

 minates itfelf at the beginning of the abdomen k. To this tube, 

 near the center of the fwelling g h i, are fixed two final 1 tranfc 

 parent bodies ; that end of thefe which is connected with the tube 

 is round, the other end is pointed ; th^fe fmall pieces cannot be 

 difcerned in every pofition of the eel. 



We muft now (hew how this duel is to be forced out of the 

 eel. The body, when comprefled, generally burfls either at the 

 head or tail, and always at that part which is lead prelled ; hence 

 when the mafs of fluids contained in the body is forced towards 

 the anterior part, they meet with a reliftance in pairing from the 

 abdomen to the dutl already defcribed ; the abdomen being 

 forced by the fluids which are made to aft againft it, burfls at the 

 upper part, and the fluids ftriking againft the neck g h i, force it, 

 with all it's contents, out of the body, through an opening at 

 nterior part ; on leflening the p refill re, the bowel, thus dif- 

 charged, will float in the water between the two plates of glafs. 



Not to enter into a detail of thofe parts which have been fup- 

 pofed by fome writers to cenftitute the heart, &c. "of thefe 

 minute animalcula, it will be fufficient here to defcribe thofe in 

 which motion may be difcovered, and to leave the reft to future 

 1 obfervations cn the fubjeft. The parts which may be feen in 

 motion within -thefe minute creatures are, 1. the fmall tube, of 

 duft, from it's origin at m, to the two appendages ; 2. thefe 

 appendages themfelves ; 3. the remainder of the tube, from the 

 appendages to the infertion at the ventricule k ; 4. in the fwell- 

 ing g k I. The reft of this duft, from the beginning by the 

 a y oefopha- 



