132 



ill still higher temperatiu-es yielding pyrocatechuic acid; dissolves in 

 4000 parts cold and in 1000 parts boiling water, readily in alcohol 

 with dark-yellow colour, also readily in ether; is precipitable by 

 glue. 



llloi'ill(liu=:C28 Hi5 Oi5. Yellow dye of the root of Morinda 

 citrifolia. Boil with alcohol, filter hot, recrystallise what has been 

 separated on cooling in alcohol, and afterwards in alcohol contain- 

 ing some hydrochloric acid, in oi'der to remove anoi'ganic salts.— 

 Forms sulphur-yellow, fine needles, of silky lustre, fusible by heat 

 and decomposing in higher temperatures; dissolves little in cold 

 with yellow colour, and readily in boiling water; forming a jelly- 

 like substance after cooling; slightly soluble in cold absolute, 

 copiously in diluted boiling alcohol; not in ether; in alkalies with 

 orange-retl, in concentrated sulphuric acid with purple-red colour; 

 precipitates the salts of the alkaline earths and of the earth-metals, 

 likewise sub-acetate of lead. 



Morillli'ic Acid. In the oil of ben (from Moringa oleifera), is 

 probably identical with oleic acid. 



Moms Tannic Acirt=:Ci8 H s Oio. In the wood of Madura 

 tinctorin, as secretion in the interior of the logs. Recrystallise 

 these secretions repeatedly in boiling water, dissolve in moi'e 

 boiling water containing hydrochloric acid, filter the solution, 

 which has become turbid after cooling by the formation of a 

 i-eddish resin, and allow the solution to stand quiet, when the 

 acid will slowly separate. — It ciystallises in light-yellow, micros- 

 copic needles, has a sweetish astiingent taste and an acid reaction ; 

 fuses at 200° and decomjioses afterwards; dissolves in 6 '4 parts 

 cold, and in 2 '14 ])arts boiling water with yellow coloiu-; readily 

 in alcohol, ether and wood-sjjirit, not in volatile and fixed oils; 

 is precipitable by glue, likewise with dark-green colour by salts of 

 oxyd of iron. 



]'Hori)hill=C'34 Hi9 NO 6 +2 HO. In opium, in the ripe and 

 in the green capsules and probably in all the other parts of 

 Papaver somniferum, also in the capsules of Papaver Rhoeas, 

 and other species of that genns [and in the herb of Argemone 

 Mexicana.] Boil the opium with water, press, and repeat these 

 operations twice; evaporate to one-half, add milk of lime; boil for 

 a quarter of an hour, strain, press, boil the remaining mass twice 

 with water, concentrate the whole of the calcareous liquids to a 

 small bulk, add chloride of ammonium, heat for an hour or as 

 long as ammonia is evolved, leave to stand cold for eight days, 

 collect the sediment, wash with cold water, dissolve in hydrochloric 

 acid, treat the solution again with lime and chloride of ammonium, 

 dissolve the deposit again in hydrochloric acid, digest the solution 

 with coal, filter, precipitate with ammonia and dry the deposit. — 



