TAPE-WOinrS OF THK SIJU-F A:\riLY AVITELLINIX-K. 378 



shown on fig. 00 ; here we find that the size of the chromatin 

 body ill the nucleus is reduced, and that now there have 

 appeared two dark-stainiug- bodies in the plasma, lying* quite 

 close to the nucleus and just opposite tlie chromatin bod}'. 

 In iron-hasmatoxylin these bodies stain to the same intense 

 bhick as the chromatin ; with Delafield's hajmatoxyliu they 

 also stain blue, but not quite as deep as the chromatin. I 

 consider them to be portions of the chromatin which have 

 been ejected from the nucleus ; in the course of the further 

 development of the egg they behave as the yolk-nucleus 

 observed by Janicki does. They are certainly not the same 

 as the yolk-nucleus observed by Spatlich in Tetrabothrium. 

 I have not seen any structure to compare with Spatlicli's 

 yolk-nucleus. There are usually only two of these problematic 

 bodies present ; occasionally, however, as shown by fig. 62, a 

 larger number can appear. Whilst they were at first situated 

 close to the nucleus, in older ovaria we find that they have 

 moved further away from it, until they have gone as far as 

 possible away from the oocyte nucleus. Fig. 61 shows the 

 emigrant chromatin bodies moving away from the nucleus, 

 and shows that they have also sepai-ated from each other at 

 the same time. A further change in the nucleus can be noted, 

 the linin threads are becoming distinct. Figs. 63-65 show 

 that a mitosis is now becoming imminent; the chromatin mass 

 has entirely disappeared, and the chromatin has rearranged 

 itself on the linin threads; the nucleolus, at first large, is 

 reducing its size. But it is also remarkable that not only has 

 the chromatin in the nucleus changed its arrangement, but 

 also the chromatin that had wandered into the plasma. In 

 the place Avhere the emigrant chromatin bodies had been one 

 now finds a mass of fine granules, and finally the only remain- 

 ing trace is a darker staining of the plasma in the viciuity of 

 the place they had occupied. It is worth noting that a pair 

 of centrosomes are often seen close to the emigrant chro- 

 matin before it dissolves. 



The mitoses that follow liave been observed, but in speci- 

 mens stained with Ehrlich's lucmatoxylin considerable luck 



