COMMENTATIO ad QUAESTIONEM MEDICAM. 



71 



B a e r , ovuH foetalis inservit , quod , vesicula post foecundationem disrupta , exprimitur , 

 nulliimnue fcre humorem assumit , antequam ad uterum pervenerit , in quo iiova mem- 

 braua , decidua dicta cingitur, cujus humore lymphatico -albuminoso , continuo a Tasis 

 uteriuis secreto ovum ipsum et foetus ad perfectam hujus evolutionem usque nutiilur; vi- 

 tellus autem avium et omnium fere reliquorum animalium cum nutrimento suo , albumi- 

 ne scilicet in oviductu recepto , praeter quod nullum aliud acquirit alimentum , a fe- 

 mellis expellitur , ita ut cum Harveyo, de Graaf, Swammerdammio , Malpi- 

 ghio, Valisnerio, Hallero, Spallanzaui aliisque dicere possimus, diflferentiam 

 ova viviparorum iiiter et oviparorum eam esse , quod primum incubationis tempus degunt 

 in utero malerno , subslantiam nutritivam foetui praebente , altera vero e corpore mater- 

 110 expclluntur et nutrimentum foetus in iis generandi üitus continenl. 



The wonderful and secret Operations of nature are 

 so involved and intricate , so far out of the reach 

 of our sensens , as they jiresent themselves to %is 

 in their natural order, tliat it is impossihle for 

 the most sagacious and penetrating Genius to pry 

 into them, un less he will he at the pains of ana' 

 lysing Nature hy a numerous and regulär seriei 

 of Experiments , wich are the only solid founda- 

 Hon , whence we may reasonably expect to make 

 any advance , in the real Knowledge of the Na- 

 iure of things. 



B A L E s« 



