CRUDE DRUGS. 



60Q 



seniia-chryosphanic acid (di-ox}methylanthraquinone). (See 

 Rhubarb.) Anthraglucosennin when acted upon by alkalies pro- 

 duces an amorphous black powder, sexna-xigrin, which also 



Fig. 263. Cassia angiistifolia (India senna): A. transverse section through tht 

 middle vein showing upper epidermis (E), palisade cells (P), rosette aggregate of calcium 

 oxalate (Od"), monoclinic prisms of calcium oxalate (o). tracheae (G), sieve (Sg), sclerenchyma 

 fibers (F). lower epidermis with rather thick-walled cells (E). B, transverse section through 

 portion of leaf between the veins showing the absence of monoclinic prisms of calcium oxa- 

 late, the presence of palisade cells and stomata in both the lower and upper portion, and 

 a hair (H) on the lower surface. C, lower epidermis on surface view; D, upper epidermis 

 showing stomata and a single hair. E, diagram of section through the middle vein, the 

 letters corresponding to those in A. After Meyer. 



yields on hydrolysis emodin and chrysophanic acid. Senna also 

 contains a yellowish, amorphous glucoside, glucosennin" ; a red- 

 dish-brown, amorphous substance, senna-rhamnetin^ which dif- 



39 



