These observation were later confirmed by Gerassimoff 

 (1890). This is the one outstanding case of an organic 

 synthesis which occurs quite Independently of the presence 

 of a nucleus. But it is to be remembered that this syn- 

 tliesis is performed by certain specific organs , the chlor- 

 oplasts, which are themselves not unlike nuclei; and in 

 fact that one step in this syntliesis may be performed by 

 chlorophyl which has been extracted from the leaves 

 (Usher and Priestly). 



'While the series of experiments which have been report- 

 ed show clearly that the nucleus is necessary for the prop- 

 er performance of certain functions by the protoplnsm, and 

 for the growth and continued life of the nrotoplasT^, the 

 converse fact must not be overlooked: that the protonlasm 

 is necessary for the performance of the functions of the 

 nucleus, and even for its continued existence. Thus in the 

 formation of new substances by the cell, the activity of 

 the cytoplasm is quite as essential as that of the nucleus- 

 This is strikingly shown by the experiments of Demoor cited 

 above. 'Alien by means of cold, narcotics, and the like, he 

 inhibited the activity of the cytoplasm, the activity of 

 the nucleus continued, but the formation of a new cell wall 

 was prevented. Moreover, Verworn (18^2) showed that nuclei 

 isolated from ihalassicolla nucleata soon disintegrated to 



(19) 



