122 CELL THEORIES. 



pared with the nuclei in textures than with proto- 

 plasm around nuclei. If certain of them are non- 

 nucleated protoplasmic masses, may not vibriones 

 be regarded as mere nuclei and nothing else? 

 Besides, in the textures, there are many nuclei 

 which have no apparent protoplasm about them ; 

 and there are also nuclei with processes, which may 

 be regarded as bodies intermediate in character 

 between the typical nucleus and the protoplasmic 

 mass. The corpuscles of the deep layers of the 

 cutis are mere nuclei, with long processes in various 

 directions ; while in the tapetum of the eye of the 

 ox long threads extend from nuclei, like the threads 

 at the extremities of fusiform cells in foetal connec- 

 tive tissue. Also, a spermatozoon may be regarded 

 as a simple nucleus. No doubt, as mentioned by 

 Strieker, both Schweiger Seidel, and la Valette St. 

 George declare that not only a nucleus, but proto- 

 plasm, enters into the construction of the sperma- 

 tozoon ; but if we examine the forms represented 

 by la Valette, both in " Strieker's Manual " and 

 in his original paper in "Schultze's Archiv," we 

 shall see that what is meant is that the proto- 

 plasm is at first adherent to the spermatozoon or 

 nucleus, and afterwards absorbed into it or other- 

 wise lost, but that there is no permanence in 

 the spermatozoon of a substance preserving the 



