166 



JULIAN S. HUXLEY. 



This is perhaps the absorptive part of the nucleolus, taking 

 up from the c3'top]asm the soluble food Avhich this in its 

 turn has abstracted from the liver-tubes. 



In the centre of the nucleolus, abutting on the absorptive 

 part, is often an area, with a reticular structure, staining 

 blue-violet with Mann's method. The remainder is com- 

 posed of a dense material staining deep red, in which are 

 embedded definite clear pink vacuoles. Towards the cyto- 



Text-fig. 3. 



Portion of a liver-tube of Anaspides with foiir couples of 

 Gany modes in it. The niiclei of the liver cells are repre- 

 sented only in one corner. I = hinien of liver tube. The 

 lig-hter parts of the parasites (e) are exposed on the exterior 

 of the liver- tube. 



plasm these vacuoles project slightly ; when one sticks right 

 out, as at X, fig. 18 6, it is colourless, showing that the others 

 look pink only because there is red substance above and 

 below them. Towards the nucleus, on the other hand, the 

 vacuoles rarely project, the edge of the nucleolus being 

 usually clean cut. Text-fig. 4 represents diagrammatically 

 another nucleolus in which the absorptive area was ex- 

 tremely large. 



