258 A CHEMICAL STUDY OF 



on a crucible lid with powdered rosaniline, it was colored red, showing the presence of 

 free fatty acids. It did not emulsify with calcium di-snlphide nor with syi'upy anti- 

 mony chloride, but it was colored dark-green by the latter. It Avas imperfectly dis- 

 solved by phosphoric acid, and slowly soluble in equal parts of cane sugar and concen- 

 trated hydrochloric acid; more rapidly soluble in equal parts of cane sugar and niti'ic 

 acid. An aqueous solution of picric acid made allvaline by sodium carbonate colored 

 the fixed oil a light reddish-brown color, cane sugar added to the solution facilitated 

 dissolving it. It was instantly dissolved by equal parts of picric acid and acid ammo- 

 nium phosphate, and on warming with stannous chloride, leaving a tui-bid yellow- 

 colored liquid. It was insoluble in aqueous barium hydrate; soluble in alcoholic am- 

 monia with no coloration, and in sulphurous acid. It was colored brown when mixed 

 with sulphuric acid of 1.634 specific gi'avity, and incompletely dissolved ; it was also 

 colored brown by ferric chloride. On adding to the fixed oil sulphuric acid of 1.475 

 specific gravity, and a small quantity of zinc, hydrogen was generated, and the solubil- 

 ity of the oil in the acid liquid was accomjjanied by a rosy tint given to the solution. 



Extract (4), Yellow Part of the Leaf. 



This extract was obtained by a similar process as that used for the other petro- 

 leum spirit extracts. The extract was a pale yellow-colored liquid. T\\q reaction was 

 slightly acid. A uniform spot was left on blue paper as the drop evaporated. The 

 petroleum spirit was evaporated at the ordinary temperature, and a yellow-colored 

 residue recovered, of a semi-solid consistency and crystalline in structure. It solidi- 

 fied at 12° C. From a definite volume of the petroleum spirit extract, the amount of 

 total solids was determined. 



TOTAIi SOI.TDf. 



Petroleum spirit residue ilried at lOQO^C 1.1 per ceut of solids. 



IIO^C 1.1 



O.UO " " loss. 



The residue was identified as a fixed oil. It was soluble in warm absolute alcohol, 

 incompletely soluble in weaker alcohol ; soluble in cold acetic ether, chloroform, ben- 

 zole, amyl alcohol, ether, carbon di-sulphide, and glycerin. It was saponified with 

 aqueous soda and a white soap separated. No reaction Avas observed with i)iciic acid 

 and ammonium phosphate, nor with nitric acid of 1.32 si)ecific gravity and 1.18 sj^e- 

 eific gravity. The fi.xed oil was soluble in jKitassio-mereuric iodide solution ; and 

 colored dark-brown by alcoholic ammonia. A mixture of fej'ric chloride solution and 

 powdered rosaniline gave a fine violet-colored reaction with the fixed oil. 



An examination of the aqueous treatment of the petroleum spirit residues (3) and 



