ON GENERATION. 189 



* part, which contains the femen, extends in 



* length, and, at the fame time, moves towards 



* the top of the cafe, which is apparent by the 

 ' vacuity left at the bottom. As foon as the 



* fcrew, with the tube in which it is inclofed, 



* begins to appear out of the cafe, it twifts, be- 

 ' caufe it is conftrained by the two ligaments. 



* The whole internal apparatus continues to 



* move gradually and flowly till the fcrew, the 

 ' piflon, and the barrel, have entirely efcaped. 



* When that happens, the remainder ilTues in- 

 ' ftantaneouHy. The pifton, Z>, [pi. Vil. fig. 2.] 



* feparates from the barrel a ; the ligament, 



* which is under the barrel, fwells and acquires 



* a diameter equal to that of the fpongy part 

 ' which fucceeds it : This, though much broader 



* than v.'hen in the cafe, becomes alfo five times 



* longer than formerly. The tube, which in- 

 ' eluded the whole, contracts in the middle, and 



* forms two knots or joints, d^ e, [pi, VII. fig. 2. 



* and 3.], diftant about one third of its length 



* from each extremity. Then the femen efcapes 

 ' by the barrel e, [fig. 2.]. It is compofed of 

 ' fmall opaque globules, which fwim in a ferous 

 ' matter, without difcovering any figns of life, 



* and are precifely the fame as I perceived them 

 ' to be when dlffufed through the rcfervoir of 



* the milt. In tlie figure, the part comprehend- 



* ed between the two joints ^/, t", appears to be 



* fringed. When examined attentively, this 



* appearance feems to be occafioned by the fpon- 



'gy 



