384 



SCIENTIFIC AND APPLIED PHARMACOGNOSY 



included large groups of stone cells having very thick and porous 

 walls; bast fibers in tangentially elongated groups separated by 

 plates of parenchyma and sieve; the bast fibers attain a length of 

 0.750 mm., the walls being nearly straight and attenuated at the 

 ends; crystal fibers surround the groups of bast fibers, each cell of 

 the former having a monoclinic rhombohedral crystal of calcium 

 oxalate; medullary rays from 1 to 3 cells wide and from 15 to 20 rows 

 deep, the walls being porous and not infrequently lignified and 

 occasionally having in the lumina reddish-amorphous masses which 

 are insoluble in alcohol. The secretory cells are somewhat elongated 

 and have a yellowish-white amorphous or granular content which is 



r,- 



rr< 



FIG. 168. Cocillana. Transverse section of the inner bark: m, medullary rays; 

 6, bast fibers ; s, collapsed sieve ; r, oleoresin secretion cells, showing an amor- 

 phous content; p, parenchyma; c, crystal fibers surrounding the bast fibers, 

 each containing a crystal which is not illustrated in the drawing. After 

 Schrenk. 



insoluble in alcohol and in dilute solutions of the alkalies, but soluble 

 in chloroform and volatile oils; the starch grains are small, spheroidal 

 and occur in the cortical parenchyma and cells of the medullary rays. 



Constituents. An alkaloid, Rusbyine; a mixture of resins, 2.5 

 per cent; a fixed oil, 2.5 per cent; a caoutchouc-like substance; and 

 tannic acid. 



Literature. Schrenk, Drug. Bulletin, 1888, p. 222. 



Azedarach. The bark of the root of Melia Azedarach (Fam. 

 Meliacese), a beautiful shade tree indigenous to Asia, and cultivated 

 in Europe and the southern United States. It is known as Pride-of- 



