iiG EXAMINATION OF 



foetus is formed of the internal fubftance of the 

 egg, and the placenta of its external parts ; that 

 the glandulous matter, which exifts not in the 

 ovarium till after a fruitful embrace, comprefles 

 the egg, and excludes it from the ovarium, &c. 

 But, though Malpighius, who examined more 

 accurately, detected many errors committed by 

 thefe anatomifts even before they were received ; 

 yet moft phyficians adopted the opinioi;i of De 

 GraafF, without regarding the obfervations of 

 jVIalpighius, which were neverthelefs of the 

 greateft importance, and which received much 

 weight from the experiments of his difciple Va- 

 lifnieri. 



Malpighius and Valifnieri, of all naturalifts, 

 appear to have written v^iih moft judgment and 

 acutenefs on the fubjed. of generation. We 

 fhall, therefore, give an account of their experi- 

 ments and remarks. 



Malpighius, after examining the tefticles of 

 a number of cows and other female animals, 

 afllires us, that he found, in the lefticles of all 

 of them, veficles of different fizes, whether the 

 females were very young or adults. Thefe ve- 

 ficles are enveloped in a pretty thick membrane,. 

 the infide of which is interfperfed with blood- 

 vefTcls ; and they are filled with a kind of lymph 

 or liquor, which coatz;ulates and hardens by the 

 heat of a fire, like the white af an eg^. 



In proccfs of time, a firm yellow body ad- 

 heres to the teflicles. It is prominent, increafes 



to 



