586 



BOTANY AND PHARMACOGNOSY. 



Fig. 255. A mixture soid as ground black pepper: A, stone cells of olive endocarp; 

 S, com and wheat starch grains; B, stone cells of pepper hulls; C, fragments of seed coat 

 and pericarp of cayenne pepper; L, crystals of calcium sulphate which separate on mount- 

 ing the specimen in 25 per cent, sulphuric acid. 



