PLATE 5 



EXPLANATION OF FIGURES 



Figures 45 to 50 are of sections fixed in 10 per cent formalin and afterw^ard 

 treated with silver nitrate according to Cajal. Figure 51: fixing in 10 per cent 

 formalin, and staining with Altmann's acid fuchsin. Figures 52 to 55, 58 and 59: 

 from sections fixed in sublimate-osmic-chromic acid, and stained in iron-hema- 

 toxylin except the figures 55 and 58, which are stained according to Altmann. 

 Figures 56 and 57: Zenker-fixing and iron-hematoxylin-staining. X2400. 



45 to 47 Transitional forms of acinus cells into islet cells, the passing out 

 of argentophile granules from the nucleus. X2400. 



48 and 50 e-cells, containing no argentophile granules, but clear vacuoles 

 corresponding to the lipoid corpuscles dissolved out. X2400. 



49 Pigment corpuscles in the cytoplasm. X2400. 



51 Showing a nucleus, the nucleolus of which contains a small clear vacuole 

 corresponding to the nucleolinus. X2400. 



52 and 53 c-cells, in which the transparent protoplasm has appeared at one 

 end of the cell. X2400. 



54 and 55 Transitional forms between the islet and acinus cell, the reappear- 

 ing of mitochondrial filaments around the nucleus. X2400. 

 56 to 58 Various phases of mitosis. X2400. 

 59 Amitotic cell-division. X2400. 



54 



