ON GENERATION. 187 



which opens outward, and through which every- 

 thing within may be forced out. It contains, 

 befides, another valve, b^ a little barrel, c, and a 

 fpongy lubftance, d^ e. Thus the whole machine 

 confifts of an outer, tranfparent, cartilaginous 

 cafe, rt, Jig. 2. the fuperior extremity of w^hich 

 is terminated, by a round head, formed by the 

 cafe itfelf, and performs the office of a valve. 

 This external cafe contains a tranfparent tube, 

 which includes the fpring, a pifton or valve, a 

 little barrel, and a fpongy fubftance. The fcrew 

 occupies the fuperior part of the tube and cafe, 

 the pifton and barrel are fituated in the middle, 

 and the fpongy fubftance occupies the inferior 

 part, Thefe machines pump the liquor of th« 

 •milt ; the fpongy lubftance is full of this liquor ; 

 and, before the animal fpawns, the whole milt 

 is only a congeHes of thefe organic hodies, which 

 have abfolutely pumped up and ilried the mil- 

 ty liquor. Whenever thefe fmall machines are 

 taken from the body of the animal, and put a- 

 mong water, or expofed to the air, they begin to 

 ad [n. VU. fig. 2. and 3.] ; the fpring mounts 

 up, and is followed by the pifton, the barrel, and 

 the fpongy fubftance which contains the liquor : 

 And, as foon as the fpring ^nd the tube in which 

 it is contained begin to iifue out of the cafe, the 

 fpring plaits, and the whole internal apparatus 

 moves, till the fpring, the pifton, and the barrel 

 have entirely efcaped from the cafe. When 

 this is eftetflcd, all the reft inftantly follow, and 



the 



