60 



DICTIONAKV OK THE ACTIVE I'KINCII'LES Ol' PLANTS. 



Soluble very readily in ether, not in water. 

 Precipitated by araruouia (not by ammonium chloride). 

 (b) PSEUDISOPYRINE A. ; resembles above, except that hydrochloride is 

 precipitated by ammonium chloride. 



§ 131. JUNIPERUS communis (Juniper); Coni/tro: The berries. 

 Investigator : Steer, Wieii. A had. Jier., 21, 383. 

 JUNIPERIN B. ; lii^ht yellow, amorphous. 



Soluble in ("lO parts water, in hot alcohol, and in ether (which removes 

 from aqueous solution). 



Ammonia dissolves with golden yellow. 

 Concentrated sulphuric acid, dissolves with light yellow. 

 § l.SJ. LACTUCA fativa (Lettuce, contains also a trace of Hyos- 

 cyamine ; see Atropa), L. virosa, L. altissima ; Conipositiv — Lif/iiliJlor<r. 

 Investigators : Kromayer, Lenoir, Fliickiger, Hesse, Franchemont, and 

 others. 



(,/) LACTUCIN B., C.-.HisO, or C.^HjA (Kromayer) ; pearly crystals, 

 fusible, bittei-, neutral, non-glucosidal. 



Soluble in hot water and in alcohol, with difficulty in cold water, not 

 in ether. 

 Reactions : 



Alkalies dissolve with gradual claret colour. 

 [Not precipitated by lead acetate, neutral or basic] 

 Ammoniacal silver nitrate, reduced. 

 Fehling's solution, reduced. 



Concentrated .sulphuric acid, dissolves colourless, gradually becoming 

 cherry red. 



(b) LACTUCOPICRIN B., C4,H3.,0„, (Kromayer); brown, amorphous, 

 bitter ; reaction acid. 



Soluble in water and alcohol. 



(r-) LACTUCON (Lenoii's), CsHojO (C,6H,,60, Fliickiger) ; crystallizes in 

 stars ; M.P. 18.'')° ; non-volatile except iu current of carbon dioxide ; taste- 

 less, odourless ; not physiologically active. 



Soluble in alcohol, ether, petroleum ether, essential and fatty oils, 

 scaicely in water. 



Not precipitated by reagents soluble in alcohol. 



(c) GALLACTUCON ( Franchemont's ' Lacti n,' from L. altissima), crystals • 

 M.P. \i[\iV. •' 



Soluble in alcoliol. 



Ul) LACTUCERIN, alpha and beta of O. Hesse. Isomeric with oj'cocerjl 

 alcohol (Sycocerol), Hydrocaiotin ?, Quebrachol, Cupreol, C'inchol — pos- 

 sibly identical with Lenoir's Lacton. r,„H™0„ = C.,H30-C,gH../J. 



Soluble in alcohol and petroleum ether. 



§ i;«. LASEEPITIUM latifolium L.; UmbeWferiE. Investigators: 

 Feldmann, A mi. Cl„ ,„. I'l,., 135, '^36 : Kuiz, Dissertation, Halle a. S., 1882. 



{a) LASERPITIN li.J\:J\.J), or V.,JJ,^0- : prismatic crystals ; M.P. 1 14°- 

 118"; bitter in ah^oholic solution (not when dry), neutral reaction. 

 Allied to Athamanthin (see Athamantha). Yields, on decomposition, 

 Laserol and Angelic acid. 



Soluble in ",l parts absolute alcohol, 30 ether, 12 carbon bisulphide, and 

 in chloroform, benzene, petroleum ether, ethereal oils ; not in water. 



Reactions : 



Alkaline hydrates, do not dissolve, or but slightly. 

 Lead acetate, neutral, ])recipitates (no pp. ? Feldmann). 

 Concentrated sulphuric acid, dissolves red. 



,, nitric ,, „ ,, 



Dilute acids do not dissolve. 



(i) LASEROL (aromatic principle), C,jH^./)j, crystalline, or brown amor- 

 phous ; taste, hot peppery. 



Soluble in alcohol and ether. 



Alkaline hydrates, dissolve yellow ; acids precipitate from the alkaline 

 solution. 



§ 134. LAURINE.S various — e.f/., Litstca chrysocoma, Litsoea Javanica 

 (about 1 per cent.), Tetranthera citrata, T. amara, T. lurida, T. inter- 

 media, Notaphoebe umbellifera, Aperula sp., Actinodaphne procera, llli- 

 gira pulchra: Substance («)■ In Hassia firnia and H. squaiTosa an 

 alkaloid was found resembling Laurotetanine (M. Greshofif). 



LAUROTETANINE A. Crystalline ; very poisimous, action like Strj-ch- 

 nine. 



Soluble with difficulty in chloroform, scarcely in ether. 



Precipitants : 



Alkaline hydrates, soluble in 



excess. 

 Sodium carbonate. 

 Tannic acid. 

 Picric ,, 

 Platinum chloride. 

 Gold chloride. 



Potassium suljihocyanide. 

 Phospho-molybdic acid. 



„ tungstic acid. 

 ^Mercuric-potassic iodide. 



,, chloride. 

 Iodine solution. 



