89 



pigment remains with the sulphide of lead, filter, and evaporate in 

 a current of carbonic acid gas. Amorphous, brown- yellow mass, 

 the solution of which greens chloride of iron. 



Second Acid=:C46 H28 O26 + HO. Boil the fruits, after ex- 

 hausting with alcohol, with water, concentrate the decoctions, 

 throw down the jelly with alcohol, strain, precipitate with acetate 

 of lead, treat the deposit with a little acetic acid, filter, remove the 

 lead from the solution by means of sulphuret of hydrogen, and 

 evaporate to dryness. 



Gailltierileil =■ C20 Hio. Contained in the oil of Gaul- 

 tiera procumbens, and probably other species of the genus, up to 

 about one-tenth of its weight. Distil the oil with potash-ley, 

 wash the distillate, consisting of wood spüit and Gaultierilen, 

 first with a very weak solution of caustic potash, afterwards with 

 pure water, desiccate the undissolved oil with chloride of calcium, 

 .and rectify over potassium. Colourless, thin, smells rather 

 pleasantly pepper-like. Is lighter than water. Boils at 160°. 



[fielseillic Acid. Is, according to Professor Sonnenschein, iden- 

 tical with Aesculin.] 



[GelseillJU. Alkaloid discovered by Wormley in the herb of 

 Gelsemium nitidum. Prepared from the aqueous liquid which 

 has served for the pi'oduction of gelsemic acid. After the g. acid 

 has been extracted by chloroform, the aqiieous liquid is rendered 

 slightly alkaline with potassa, and repeatedly shaken with chloro- 

 form. On evaporating the latter, a hard gummous body remains, 

 which has to be treated with water acidulated by hych'ochloi-ic 

 acid in order to dissolve the alkaloid. Filter, concentrate to one- 

 sixteenth of the origmal fluid extract, add caustic potash in slight 

 excess, collect the precipitate, wash with water and dry. Dissolve 

 again in acidulated water, precipitate with potash and extract 

 with ether. After evaporation the G. remains as a hard shining 

 mass, yielding a colourless i^owder. The G. is a strong poison of 

 an intensely bitter taste, and forms salts with acids. It is 

 spaiingly soluble in water, easily in ether (25 parts), and in 

 chloroform. Concentrated sulphuric acid colours it red-brown, 

 the solution becoming pui'ple on careful heating; nitric acid dis- 

 solves it with green, hydrochloric acid with yellow colour. A 

 little below 10U° C. it fuses to a viscid mass which congeals to a 

 translucid body; in higher temperatures it sublimes unaltei-ed. The 

 Gelsemin compounds are precipitated by caustic alkalies; an excess of 

 the latter redissolves the precipitates. Bichromate of potash pi-o- 

 duces a copious yellow, amorphous precipitate, sparingly soluble in 

 acetic acid ; picric acid yellow ; biiodide of potassium brown even 

 with diluted ( Yioooo ) solutions ; bromine in hydrobromic acid 

 yellow ; the chlorides of gold and of platinum likewise ; sulpho- 

 cyanide of potassium dirty white in moderately diluted solution ; 



