2O4 R. S. LILLIE. 



tion of certain of the structural elements of the cell. How far 

 such conditions have to do with form-determination in general is 

 a further question, and one that stands in urgent need of thor- 

 ough-going investigation. It may prove necessary to add elec- 

 trostatic attractions and repulsions to the list of the conditions 

 determinative of organic form and structure. 



NAPLES, December 12, 1904. 



