192 



CYTOLOGY 



CHAP. 



taking place apparently from any part of the nuclear surface 

 (Fig. 81, G). 



As to the way in which chromidia get out of the nucleus, opinions 





Fig. 81. 



Illustrating the supposed emission of chromidia from various Metazoan cells. A, B, C, oocyte of 'Aricia 

 foetida (alter Schaxel, Z.J. A., 1912). A, young oocyte, chromosomes still filamentar, cytoplasm destitute of 

 chromidia ; B, older oocvte, still no chromidia in the cytoplasm ; C, still older oocyte, showing emission of 

 chromidia from the nucleus into the cytoplasm. D, oocyte of Antedon bifida (after Chubb, Phil. Trans., 1906). 

 Discharge of comparatively large masses of chromatin from the nucleolus. E, spermatocyte I. of Blatta ger- 

 manica (after Wassilieff, A.m. A ., 1907). F, oocyte of Proteus anguineits (after Jorgensen, F.H., 1910). G, H, 

 somatic cells of Musca (after Popoff, F.H., 1910). G, emission stage ; H, the chromidia congregated into a 

 band round the nucleus. 



are divided as to whether they pass as formed bodies through deficiencies 

 in the nuclear membrane (Buchner, 1910), or whether they are passed 



