PLASMA-STRUCTURE IN EGG OF HYDRACTINIA 



211 



'98, Mann '02, Prenant '10 a, Lundegard '12, et al.). The consensus 

 of opinion on the subject is that even though staining may be 

 chemical it cannot be rehed upon as indicative of chemical simi- 

 larity of cell materials. This is clearly shown by Mathews ('98) 

 and Zacharias ('97) who have demonstrated that previous acid or 

 alkaline treatment determines what stain is selected by any cell 

 element. The above experiments confirm the conclusion that 

 similarly staining elements can hardly be considered identical. 

 Again, experiments with egg albumen fixed in the various killing 

 fluids according to Mann's method, confirm his results in that an 



TABLE 2— Continued 

 Mature eggs 



3 The oil globules were not identified in any of these tests. 



* These stains furnished by the Caaella Color Company, New York, were found to be perfectly harm- 

 less used in dilute solution (Kite '13). 



' The nucleolus, large globules and oil have not been identified in fresh material. 



