560 THE STRUCTURE AND DEVELOPMENT 



This body, by the use of high objectives, is seen to be composed 

 of a number of deeply stained granules, and around it may be 

 noticed a clear space, bounded by a very delicate membrane. 

 The granular body usually lies close to one side of this mem- 

 brane, and occasionally sends a few fine processes to the 

 opposite side. 



The whole body, i.e. all within the delicate membrane is, 

 according to my view, a modified nucleus ; as appears to me 

 very clearly to be shewn by the fact that it occupies the normal 

 position of a nucleus within a cell body. Semper, on the other 

 hand, regards the contained granular body as the nucleus, which 

 he compares with the spindles of Biitschli, Auerbach, &c.\ This 

 interpretation appears to me, however, to be negatived by the 

 position of these bodies. The manner in which Semper may, 

 perhaps, have been led to his views will be obvious when the 

 later changes of the primitive ova are described. The formation 

 of these nuclei would seem to be due to a segregation of the 

 constituents of the original nuclei ; the solid parts becoming 

 separated from the more fluid. As a rule, the modified nuclei 

 are slightly larger than the original ones. In stage Q the fol- 

 lowing two tables shew the dimensions of the parts of three 

 unmodified and of three modified nuclei taken at random. 



Primitive ova with unmodified nuclei 



Nuclei 



o'oi 4 mm. 

 O'oi 2 mm. 

 o'oi mm. 



Primitive ova ivith modified nuclei 



Granular 

 Nuclei. Bodies in Nuclei. 



O'oi 8 mm. ...... o'oo6 mm. 



o'oi 8 mm O'oo6 mm. 



o'oi 2 mm O'oog mm. 



For a slightly older stage than Q, the two annexed tables 

 also shew the comparative size of the modified and unmodified 

 nuclei : 



1 Loc. fit. p. 361. 



