192 



Kicillill. In the seeds of Ricinus communis. Boil rei:)eatedly 

 with water, evapoi'ate the liquids, aftei- the fixed oil has been re- 

 moved as completely as possible, to honey-consistence, boil with 

 alcohol, filter, free the tincture from the resin after 24 hours, and 

 distil ofi" the alcohol. In the remnant, crystals of Ricinin are 

 formed after some time, which have to be purified by recrystal- 

 Using in alcohol with aid of animal charcoal. — Forms coloui-less, 

 rectangular prisms and scaly laminae of a slight taste of bitter 

 almonds; fuses by heat, sublimates unaltered; dissolves in water 

 and in alcohol, scarcely in ether, in benzol, in concentrated 

 sulphuric acid without colour, the solution assuming a green tinge 

 with Chromate of potash ; in nitric acid without decomposition. 



Ricinoleic Acid^Cse H33 O5 -1- HO. In the oil of the seeds 

 of Ricinus communis. Saponify, salt out, decompose the soap with 

 hydrochloric acid, and refrigerate the oily mixture containing the 

 R. acid and a little solid acids, under addition of 3 volume of alcohol 

 to a temperature of — 10° to — 12°, when the solid acids will crystal- 

 lise. After removing the latter, and driving off the alcohol, 

 Ricinoleate of lead is obtained by digestion with oxyd of lead, and 

 which has to be dissolved in ether, and is deconipo.sed with water 

 and hydrochloric acid. Purify the R. acid which remains after the 

 evaporation of the ethereous liquid by dissolving in liquor of am- 

 monia, precipitating with chloride of baryurn, recrystallising the 

 baryum-compound in alcohol, decomposing with tartaric acid and 

 washing with water. — Light wine-yellow, syrup like liquid of 0*94: 

 density, inodorous, of a strong and lasting, disagreeable, acrid taste, 

 dissolved in alcohol of acid reaction, congeals at — 6° to —10° 

 (according to others at 0°) to a granular mass, dissolves in alcohol 

 and in ether in every proportion. The Ricinoleates dissolve all 

 in alcohol, some of them also in ether, are not liable to oxydise 

 by keeping. 



Riozolic Aci(l=PiPiTZAHoic Acid, 



Robillill=C5o H30 032+11 HO. Yellow, crystalline glucosid of 

 the flowers of Robinia Pseudacacia. Boil with water, use the decoc- 

 tion six to eight times for boiling anew fresh flowers, evaporate to a 

 syrup thickness, treat with hot alcohol, filter, distil the alcohol ofi" 

 and allow the remnant to foi'm in crystals. Dissolve the latter, 

 after fi-eeing from the bulk of the mother-ley by pressing and 

 washing with cold alcohol, in boiling water, and mix the solution 

 with acetate of lead, which throws down foreign matters and 

 leaves the Robinin dissolved. The R. is obtained by evaporating 

 the filtrate, freed from the lead by sulphuret of hydrogen, and is 

 then recrystallised in water. — Forms veiy fine, straw-yellow 

 needles of a sliglit satin-lustre, neutral, tasteless, in aqueous solu- 

 tion of a slightly astringent taste; loses its water at 100°, fuses at 

 195^, and decomposes in a higher temperature, producing quercetin 



