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. 

 foetida (after Schaxel, Z.J.A., 1912). 



A, B, C, oocyte of Aricia 



A, young oocyte, chromosomes still filamentar, cytoplasm destitute of 



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

 chromidja 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 Blatia ger- 

 manica (after Wassilieff, A .m.A ., 1907). F, oocyte of Proteus anguineus (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 



