EI SEN. [Vol. XVII. 



III. Constituents of the Cell. 

 General Divisions of Cell Structures. 



The division of the cell structures adopted in this paper is 

 almost the same as the one proposed in my paper on the plas- 

 mocytes of Batrachoseps, the only important change being 

 that of the word centrosome to centriole. The principal rea- 

 son for this change is that many investigators have not only 

 used this word for different structures, but in some instances 

 have even discarded it altogether. The confusion is really so 

 great that it is in many instances impossible to know with cer- 

 tainty what organ or what part of the cell is referred to. W. 

 Flemming, in his report, " Morphologic der Zelle," 1897, rejects 

 the name centrosome and substitutes the word "Centralkorper." 

 As this word cannot possibly be accepted by other investiga- 

 tors than Germans, and as Boveri has previously named this 

 body the centriole, I can see no valid reason why we should 

 drop 'a really very useful word, about the meaning of which 

 there cannot be any misunderstanding, and which is so con- 

 structed that it can be adopted in every language used by biol- 

 ogists. Literal translations of new words often so conflict with 

 words already existing that great confusion results. It seems, 

 therefore, most appropriate that in composing new words they 

 should be so constructed that they may with a slight change be 

 used in other languages, or, better yet, be used without any 

 change. Words of this kind are, of course, words of Greek 

 and Latin derivation. I would also suggest that every biologi- 

 cal paper be accompanied by definitions of the nomenclature, 

 worded in such a manner that no misunderstanding will ensue. 

 If such a method had been adopted, we would not now have 

 had years' wrangling about, for instance, the single little word 

 " centrosome." 



In this paper I propose to use the following nomenclature 

 for the divisions of the cell : 



Cytosome — the purely cellular part of the cell, the cytoplasmic 

 parts, all parts exterior to the nucleus, except those bodies which 

 are known as archosomes or parts belonging to them. The cyto- 



