838 



BOTANY AND PHARMACOGNOSY. 



is given by the larger crystals, which shows that the axial plane 

 is perpendicular to the long dimension of the crystal. No in- 

 terference figure was obtained on the twinned crystals (which 

 were smaller), so that their orientation is doubtful as noted 

 above. 



Fig. 336. Hydrastine: large nearly equidimensional crystals from alcoholic solution. 



Hydrastine (CoiHoiNOq). 



Occurrence : See p. 498. 



Hydrastine occurs in the drug in part in the free condition 

 as well as combined. At i8-22 C. one part of hydrastine is 

 soluble in 30,303 parts of water; about 130 parts of alcohol; 

 196 parts of ether ; i part of chloroform ; and 1 1 parts of 

 benzene. At 80 C. one part of hydrastine is soluble in 4000 



I 



