EXPLANATION OF PLATES 



Plate L (Diospyros Kaki, "Zengi") 

 (Photomicrographs) 



Fig. 1. A group of shrunken, dead (red) tannin cells {t) with four living ones 

 at {a). At (6) the parenchyma cells are attached to the dead tannin cells. 



Fig. 2. A tannin mass (colourless) by transmitted light. Canals and fusiform 

 spaces are to be seen inside. 



Fig. 3. A tannin mass which has undergone syneresis. 



Figs. 4 and 6. Precipitation membranes produced on diffusion of tannin from 

 the tannin mass into the surrounding medium which contains pectose. 



Fig. 5. Section through the outer part of the pericarp, showing the distribution 

 of tannin cells. 



Fig. 7. Strands of shrunken red tannin masses {t) and intercellular tannin, 

 appearing as a dark network between the parenchyma cells. 



PLATE n. 



(Photomicrographs) 



Fig. 1. Strands of tannin cells which have been teased out from the pericarp 

 of Musa (edible). They lie in double chains following the vascular bundles. Pre- 

 paration in water. 



Fig. 2. The same on the addition of weak ammonia. 



Fig. 3. More highly magnified view of two adjacent tannin cells with the 

 tannin masses slightly protruding from their ruptured adjoining ends. In water. 



Fig. 4. The same preparation on the addition of ammonia. Here the gelatinous 

 character of the swollen tannin masses is very clearly shown. 



PLATE III 



The different character of the precipitated tannin related to the various amounts 

 of the tannin diffused from the associated emulsoidal masses, swollen in the acids 

 and at the concentrations indicated on the margin of the figure. Persimmon 

 (Diospyros Kaki) " Zengi." X 2/3. 



