DICTIONARY OF THE ACTIVE PRINCII'LES OF PLANTS. 



Hydrochloric acid hot, gives rise to a green substance. 

 § 140. LOBELIA iuflataL. ; Caiitpanuhicnc. Inve.stigators : F.Mayer 

 VierUlJ. priirl. I'lianii., 15, 233 ; Lewis, Pharm. J., Trans., [3], 8, 561. 



(a) LOBELIINE A.-G.'- (Lobelina) ; oily yellowish-white, alkaline, taste 

 acrid. Yields sugar on long boiling. Salts crystalline (not the acetate). 

 Soluble in water (with yellow colour), in alcohol, amyl alcohol, chloro- 

 form, ether (ihe best solvent), benzene, petroleum ether, carbon bisulphide, 

 fatty and essential oils. 



Contrary to the behaviour of substances of its class, it is removed from 

 acid solution by petroleum spirit and chloroform. 

 Precipitants : 



[Alkaline hydrates, decomposs with production of substance having 



aromatic odour.] 

 Ammonia, white pp. 

 Lead acetate, neutral, white needles (no pp. ?). 



., ,, basic (no pp. ?). 



Tannic acid, pp. solution in excess, or in ammonia. 

 [No pp. gallic acid.] 

 Picric acid. 



Ferrous sulphate, brown pp. 

 Platinum chloride, pp. floats (aqueous solution). 

 Gold chloride, pp. insoluble in hydrochloric acid (aqueous solution). 

 Silver nitrate, white pp. sol. ammonia or nitric acid (aqueous solution). 

 Fehliug's solution, reduced after hydrolysis of L. 

 Phospho-molybdic acid, yellowish-white ; ammonia changes blue, then 



colourless. 

 Metatungstic acid. 



lodo-potassic iodide (acid solution), brown. 

 Mercuric-pota.ssic iodide (acid solution), pale yellow. 

 [Mercuric chloride, no change.] 

 [Albumen, not coagulated.] 

 (Jharcoal, absorbs. 

 Colour tests : 



Concentrated sulphuric acid, reddish-brown ; intensified by potass. 



bichromate. 

 Friihde's reagent, reddish-brown. 

 (//) LOBELACRIN is considered by Lewis to be a salt of Lobeliine, with an 

 acid resembling gallic, and named Lobelic acid. 



Alkaloidal glucosiile. 



§ 141. LOLIAM telumentum (poisonous darnel grass); Graminaivm. 

 The seed. Investigators: liudwig and Stahl, Arrhiv Pliarm., [2], 119, ;')9 ; 

 P. Antze, and others. 



LOLIIN G. ; dirty white, amorphous, bitter. Yields sugar and volatile 

 acids. Forms crystalline salts with sulphuric and hydrochloric acids. 



Soluble in water and alcohol, not in ether. 



§142. LONICERA xylosteum,L. (Honeysuckle) ; C'aprifoHwfte. The 

 berries. Investigator : Enz, VierlelJ. /irart. Pharm., 5, IKO, and others. 



XnOSTEIN G. ; crystalline needles : M.P. 100' (fusible to colourless 

 liquid, recryslallizing on cooling) ; neutral, slightly bitter, poisonous. 

 Acids give sugar and a derivative of Xvlostein. 



Soluble in hot water (scarcely cold), in alcohol and ether (which removes 

 it OM shaking with aqueous solutions). 



Not precipitated by neutral lead acetate. 



Concentrated sulphuric acid, brown. 



§ 14:1. LOTUS bark (Symplocos racemosa); Slyracete. The bark gave 

 0'24 per cunt. {a), and 002 per cent. (b). 



(d) LOTURINE A. ; crystallizes in efflorescent prisms ; M.P. 234' ; alka- 

 line reaction. Salts with mineral acids show bluish-violet fluorescence. 



Soluble in alcohol, ether, chloroform, acetone ; scarcely in water. 



The alcoholic solution is precipitated by potass, sulphocyanide. 



{Ii} COLLOTURIN A. ; crystallizes in non-efflorescent prisms, giving subli- 

 mate at 2.i4'; alkaline reactions. Salts fluorescent as (a). 



Soluble in alcohol and ether. 



Precipitants : 



Gold chloride, yellow flocculent. 



Potass, sulphocyanide (to the alcoholic solution). 



((•) LOTURIDINE A. ; amorphous ; bluish-violet fluorescence. 



Potass, sulphocyanide gives no pp. (compare above). 



(d) CALIFORNINE (of Winckler) contains the 3 alkaloids above. (For 

 Calif ornin, see Cinchona group.) 



g 144. LUPINUS albus, L. luteus, and others (ic.7«m/no.<(i), substances 

 (a), (/'), ('■), etc. ; L. angustifolius (Blue Lupines), (rf), 165 gms. from 

 2 cwt. of the seed. 



Arginine (e) is a proteid decomposition product found in etiolated 

 Lupine cotyledons, as well as in Soja hispida and Cucurbita pepo, grown 

 in the dark. 



After fermentation, the following decomposition compounds from pro- 



