KARYOKINESIS. 73 



by Boveri, or, rather, the modified form of it, viz., Archiplasm, which has been 

 widely used and accepted, ought still to be applied to this substance, even though 

 Boveri's views as to its characteristics may not be fully accepted in all cases. For- 

 tunately it is not generally considered necessary to change the name of a thing 

 every time we change our views as to its qualities. Neither the cell itself nor any 

 morphological element of it means to all investigators the same thing which it meant 

 to its discoverer, and yet we generally find it advisable to retain the old name, 

 changing our conception of the thing named as our knowledge advances. 



10 JOUEN. A. N. S. PHILA., VOL. XII. 



