THE JOURNAL OF PHARMACOLOGY. 59 



Tincture of alkanet. 



C.i Red cell contents Resins. (5) 



C.11 No visible reaction. 



D.i Crystalline bodies. 



E.i Crystalline masses, rounded Inulin 



E.n Crystals distinct, not rounded. 



F.i Dissolves in HC1 without effervescence. 



Treat with dilute neutral AgNO g . 



„ ... ( Calcium 



G.i Assumes yellow color J 



j phosphate. (6) 



... 1 Calcium 



G.11 Does not assume yellow color J 



. TT ™ .x, « ( Calcium 



F.11 Dissolves in HC1 with effervescence carbonate 



F.111 Dissolves in HC1 little or none. (Seldom , Calcium 

 present in plants) • j sulphate. 



D.11 No crystalline bodies. 



E.i Soluble in cold absolute alcohol, ropy 



masses Volatile oils. (7) 



E.n Insoluble in cold absolute alcohol. 



F.i Soluble in ether, spherical masses Fatty oils. (8) 



F.n Insoluble in ether. 



G.i Incinerating- without ash Gums. (9) 



G.11 Incinerated, leaves ashy skeleton Silica. 



(Treat with HC1 to remove Ca salts.) 



CONFIRMATORY REACTIONS. 



(1) Tannins. 



In sections not wetted either with water or alcohol, when placed in 

 ferric sulphate, tannins take on a deep blue or deep green color. 



(2) Protoplasm and Proteids. 



In Millon's reagent a rosy-red color appears after a time, especially after 

 wanning. 



[ Millon's reagent is mercury dissolved in its own weight of cone, nitric 

 acid, the solution then diluted with an equal volume of distilled water. 

 Reagent to be used when fresh.] 



(3) Plant mucilages. 



Usually swell in water. Iodine and H 2 S0 4 give either a blue or a violet- 

 brown color. 



(4) Suberin. 



Insoluble in cone. H 2 S0 4 . In boiling KOH ochre-yellow, granular 

 masses are exuded. Stains blue in aniline violet, especially plainly when 

 color is drawn from non-lignified tissues by use of acidulated alcohol. 



(5) Resins. 



in sections mounted in water, and not previously exposed to alcohol 



