216 



Constituents. A number of alkaloids have been isolated, of 

 which aconitine is the most important; it occurs to the extent of 



FIG. 95. Various forms of stone cells in Aconite root. The cells vary in form, 

 size and thickness of the walls. They are from 0.051 to 0.391 mm. hi length, 

 fom 0.034 to 0.102 mm. in width, the thickness of the wall being 0.008 to 

 0.025 mm. The average length is about 0.120 mm., width 0.070 mm. and 

 thickness of wall 0.010 mm. The outline of the lumina of the cells varies 

 from nearly smooth to slightly irregularly undulate or more or less ragged 

 and angular. After Stingel, Amer. Jour. Pharm., 1913, p. 391. 



about 0.75 per cent, and forms prisms (Fig. 96), which are not col- 

 ored by concentrated sulphuric or nitric acid. An aqueous solution 



