29 



ular stone cells of the mesocarp will be stained yellow. These 

 cells are so irregular and grotesque as to be characteristic of the 



Figure 20 

 Fig. 20. Olive Pomace, (m) Cells of mesocarp and (s) isolated stone 

 cells from same. 



olive. The pigment cells containing a purple coloring matter 

 are stained red with sulphuric acid. Fig. 20 shows the stone cells 

 as well as some of the pigment cells. 



CASTOR POMACE. 



This substance need not be looked for unless sickness is report- 

 ed among animals fed, as it is not used as a feed owing to the 

 poisonous principle it contains. 



Fig. 21. Castor Pomace, (e) Outer epidermis, surface view, and (p) 

 palisade cells. 



It is the residue left after the oil has been expressed from the 

 castor bean. {Ricinus cmmunis, L.) 



The polygonal cells of the epidermis are pitted and may or 

 may not contain a pigment of a brown color. These cells vary 

 greatly in size. The brown sclerenchymatized palisade cells up- 

 wards of 200/x long, with brown walls and distinct pores are also 

 an aid to diagnosis. In surface xdew the cells are polygonal and 

 about 10 — lojx in diameter. Fig. 21 shows these elements. 



