limited, its days are n\imbered, just as are those of the 

 medullited nerve fiber which has been severed from its 

 nucleus. 



ciuch were the facts which the older biologists had at 

 their disposal in the attempt to solve the proMem of the 

 function of the cell nucleus: and these facts together 

 with certain subsequent experimental developments have 

 led to the formation of two main theories with regard to 

 the function of the cell nucleus. The first and oldest 

 theory I have been unable to find clearly stated by any 

 ■earlier writer than Claude Bernard: it asserts that the 

 nucleus is responsible for the building up processes, the 

 synthetic or anabolic activities of the cell. "II semble 

 liue la cellule qui a perdu son noyau soit st^rilise'e au 

 point de vue de la generation, c'est-a-dire de la synthese 

 raorphologisiue, et iiu'elle le soit aussi au point de vue 

 de la synthese chimi^iue, car elle cesse de produire des 

 principes imme'diats, et ne peut guere qu'oxyder et detru- 

 ire ceux qui s*y etaient accumules par une elaboration 

 ante'rieure du noyau. II semble done que le noyau soit le 

 germe de nutrition de la cellule; il attire autour de lui 



et elabore les mati»riaux nutritifs." "Le protoplas- 



ma circumnucleaire, d' autre part, renfermerait tous les 

 produits de 1 • elaboration synthetique du noyau, c'est-a- 

 dire les principes immediats destine's a se detruire et 



(B) 



