PROTOPLASM 15 



In such systems as those under discussion the liquid phase corresponds to the "non- 

 staining " substance of histologists. 



10 UL 



A 

















B 



FIG. 16. CELLS OF GUT OF ONISCUS. Stained with iron hrematoxylin. 

 Drawn with camera lucida. 



A, after fixation with osmic vapour. 



D, after fixation with mercuric chloride. 



(Hardy, 1899, 1, figs. 18 and 19.) 



If we turn to cells themselves, we find that the same cell shows a different 

 structure of its protoplasm according to the fixing reagent used. For example, 



