POWDERED DRUGS AND FOODS. 



777 



tion cells with suberized walls ; oil globules numerous ; fragments 

 of powder becoming wine-colored with sulphuric acid. 



187. DELPHINIUM. — Grayish-bro\\n or light brown; stone 

 cells of outer epidermis radially elongated, with thick walls and 

 simple pores resembling those of staphisagria ; a layer of pigment 

 cells ; fixed oil, and aleurone grains. 



Fig. 313. Vanilla; S, fragments of seeds showing characteristic stone cells; B, 

 parenchyma cells with narrow-elongated simple pores; P, parenchyma containing oil 

 globules; T, trachese; L, lignified cells with simple pores; Ca, raphides of calcium oxalate ; 

 H, papillae-like hairs from the inner surface of the pericarp which are occasionally seen 

 massed together. 



188. STRAMONII SEMEN.— Brownish-black or grayish- 

 black (Fig. 122, 5) ; epidermal cells with thick mucilaginous 

 outer walls, a small lumen and dark brown contents. Beneath the 

 epidermis is a layer of thick-walled, nearly colorless cells with 

 distinct, crescent-shaped lamellae in the radial vralls and reticulate 

 pores. The cells of the endosperm contain considerable oil and 

 more or less numerous aleurone grains, the latter having i or 2 

 crystalloids and a number of globoids. 



