The Microscope. 293 



Some authors have used a technical word for every stage or 

 phase in cell-division, and Carnoy is careful to avoid every such 

 term, contenting himself with stating that cell-division takes 

 place by constriction or by a cell-plate or by both at the same 

 time ; and the various stages or phases of these different modes 

 of divisio.i are simply desci'ibed without giving to each a special 

 technical term. For this he has been severly criticised by 

 Flemming, who seems to have a great attachment for technical 

 terms. Every one to his own taste ; but I believe most scientists 

 will prefer common words, as long as they are adequate and to 

 the point. I am not opposed to the use of technical terms when 

 they are necessary ; but when they become a burden and often 

 a hindrance to the progress of science, they are not only unnec- 

 essary but positively injurious. In order to be more explicit, I 

 will introduce the common words which Carnoy uses, with the 

 technical terms which he proposes for those who prefer to use 

 them. 



Division Dieresis. 



Cell-division Cytodieresis. 



Nuclear-division Karyodieresis. 



Plasmatic-division Plasmodieresis. 



Kinetic-division Kinesis. 



Akinetic-division Stenosis. 



Kinetic nuclear division Karyokinesis. 



Akinetic nuclear division Karyostenosis. 



Kinectic plasmatic division Plasmokinesis. 



Akinetic plasmatic division Plasmostenosis. 



In justice, I must say that not all of these terms have been 

 introduced by Carnoy, but they are somewhat familiar to Amer. 

 ican scientists as they have been used by some of our authors ; 

 Flemming's terms have not been used, at least, not to my know- 

 ledge ; for kinesis he uses mitosis, and we therefore would have 

 to speak of mitotic movements in the nucleus, whilst the expres- 

 sion " kinetic movements " is more familiar to an English ear. 



The following terms are those used by Carnoy to represent 

 the various stages of cell-division : 



1. Breaking up of the nuclear tubule. 



2. Equatorial crown. 



3. Polar movements. 



4. Polar crowns, 



5. Reconstitution of the nucleus. 



