418 Mr. Tilley on some of the Products of 



fatty mass which remains in the retort be mixed with water 

 and distilled, an additional quantity of the acid will be ob- 

 tained. 



It must be separated from the acid fluid on which it floats, 

 mixed with water and redistilled, which process must be re- 

 peated several times. After this it must be dried by standing 

 over melted phosphoric acid, chloride of calcium not being 

 adapted to the purpose, it being a little soluble in the acid. 



The acid procured in this way is perfectly colourless and 

 transparent, having an agreeable aromatic smell and a sweet 

 stimulating taste. It is sparingly soluble in water, imparting 

 to that fluid its peculiar smell. It is soluble in nitric acid, 

 alcohol and aether. When raised to the temperature of 148° C. 

 it begins to boil, and a small part distils over ; but if kept for 

 some time at that temperature, it becomes black and is de- 

 composed, giving off'empyreumalic products, so that it cannot 

 be distilled alone. It burns with a clear flame, giving little 

 smoke. It does not become solid though cooled to — 1 7° C. 

 To this body I have given the name of CEnanthylic Acid, for 

 reasons which will be stated in another part. 



To determine its composition the acid was burned with 

 oxide of copper. 



1st. 0*3305 substance gave 0-7810 carbonic acid, and 0*3330 

 water. 



2nd. 0*4295 substance gave 0*9905 carbonic acid, and 0*4009 

 water. 



This gives in 100 parts, 



1st. 2nd. 



Carbon 65*34 65*33 



Hydrogen 10*83 10*60 



Oxygen 2383 24*07 



100*00 100*00 



CEnanthylic JEther. — This aether is formed by dissolving 

 the acid in strong alcohol, and passing a stream of hydro- 

 chloric acid gas through the solution. To the mixture is 

 then added carbonate of potash, in order to neutralize all free 

 acid ; it is then distilled. The aether passes over into the re- 

 ceiver, and may be freed from any alcohol that it may contain 

 by agitation with water. It must, lastly, be distilled over chlo- 

 ride of calcium in a stream of carbonic acid gas, as it is de- 

 composed by the oxygen of atmospheric air, at the tempera- 

 ture of its boiling point. 



The oenanthylic sether so obtained is a colourless fluid, 

 lighter than water, having a peculiar and agreeable smell not 

 unlike that of nitrobenzide. It has a sweet and somewhat 



