570 



BOTANY AND PHARMACOGNOSY. 



externally dark brown, coarsely reticulate, apex with remains of 

 3 to 4 stigmas ; pericarp about 0.3 mm. thick ; internally light 

 brown, smooth, oily, i-locular, i-seeded; seed atropous, broadly 



Fig. 249. Pericarp of fruit of Juglans regia: A, stomata of epicarp; B, cross-section 

 of pericarp showing epidermis (e), cells with reddish-brown contents (c), sclerotic cells (s), 

 parenchyma (p) containing protoplasm and starch grains; C, mestome strand of the sarco- 

 carp showing vessels (v), libriform (1), leptome (s), parenchyma containing protoplasm and 

 starch (p); D, non-glandular hairs from the apical and basal portions of fruit; E, glandular 

 hairs from base of fruit similar to those found in large numbers on the surface of the butter- 

 nut (Juglans cinerea): F. rosette aggregates resembling the membrane crystals of Rosanoff; 

 G, sclerotic cells found in the powder; H, fragment of non-glandular hair; K, starch grains 

 from 2 to lo M in diameter; L, tracheae with annular markings; M, calcium oxalate crystals. 



ovoid, 4 to 5 mm. in diameter, reddish-brown, straight, mostly 

 smooth on one side where it lies against the pericarp, chalazal end 

 with a broad scar, micropyle with a slight depression, a small 



