88 PHARMACEUTICAL BOTANY 
which contain this constituent are mounted in a solution of 1 part 
of ammonium vanadate in 1000 parts of a mixture of 49 parts of 
sulfuric acid with 18 parts of water, the cells containing solanin 
take on a yellow color which changes successively to orange, 
Fic. 51.—Various forms of calcium oxalate crystals. A, styloids from the 
bark of Quillaja saponaria; B, rosette aggregate from rhizome of Rheum officinale; 
C, raphides from the bulb of Urginea maritima; D, crystal fiber as seen in longitudinal 
section in either the xylem or phloem regions of Glycyrrhiza; E, micro-crystals 
(crystal sand) isolated from the parenchyma of Belladonna root; F, monoclinic prisms; 
and G, twin-crystals from leaves of Hyoscyamus niger. All highly magnified. 
various shades of red, blue-violet, grayish-blue and then 
disappears. 
10. AspARAGINE (CyHsN, + H,O).—This is an amino com- 
pound of crystalline nature which occurs widely in the plant 
kingdom. It has been found in certain of the slime molds and 
fungi, in the roots of Althea officinalis and Atropa belladonna, in 
young shoots of Asparagus, in the seeds of Castanea dentata, in the 
