^22. 



BOTANY AND PHARMACOGNOSY. 



in groups of three to eight and spreading from the base. The 

 calcium oxalate crystals are numerous, in rosette aggregates or 

 in monocHnic prisms, lo to 35 \t, in diameter, occasionally in crys- 



FlG. 284. Forms of non-glandular hairs; A, hair from the epidermis of strophanthus; 



B, a hair from the capsule of Mallotus philippinensis (found in the drug known as kamala) ; 



C, hairs from the leaves and bracts of cannabis indica, two of them containing cystoliths 

 of calcium carbonate; D, a hair from the under surface of the leaf of senna; E, hairs from 

 leaf of digitalis; F, two forms of hairs from sage leaf; G, two forms of hairs from the leaves 

 of wormwood {^Artemisia Absinthium) : a T-shaped non-glandular hair and a short glandular 

 hair. 



tal fibers; the parenchymatous cells contain irregular yellowish- 

 brown tannin masses which are colored blue with ammonio-ferric 

 alum solution. 



