24 Mr. Noad on the Action of Nitric Acid on Cymol. 



Toluylate of Copjicr.—Thh salt was prepared by dropping a 

 solution of sulphate of copper into a perfectly neutral solution 

 of toluylate of potash; it fell as a bright blue precipitate 

 closely 'resembling the corresponding bcnzoate. It is very 

 soluble in ammonia, forming a dark blue solution, and soluble 

 to a slight extent in boiling water, separating on cooling as a 

 granular precipitate : its analysis gave the foUowingresult. _ 



0'33S5 grm. ignited, the residue treated with nitric acid 

 and again ignited gave 00822 grm. of oxide of copper =24-28 

 per cent,, agreeing with the formula CuO, Cjg H7O3. 



Theory. Exjieiimciit. 



1 equiv. Anhydrous acid 127'0 7C"19 



1 ... Oxide of copper 39-7 23-81 24-28 



I66-7 100-00 



Toluylate of Oxide of Ethyle. — This compound was formed 

 by transmitting a stream of dry hydrochloric acid gas through 

 a solution of the acid dissolved in strong alcohol, until the 

 latter fumed strongly ; it was then distilled, about two-thirds 

 drawn over, and the residue in the retort mixed with water ; 

 the new^ jether precipitated in the form of a dark heavy liquid ; 

 it was digested with ammonia to remove any uncombined to- 

 luylic acid, well-washed with distilled water, dried, by being 

 allowed to remain for some time in contact with pieces of 

 fused chloride of calcium, and then distilled : it passed into 

 the receiver nearly colourless, but on standing it deposited a 

 small quantity of crystalline matter, which proved to be the 

 aether of the nitrogenous acid, the acid employed not having 

 been obtained from the baryta salt. By a second distillation, 

 collecting only the first portions, the whole of the other aether 

 was removed and a pure substance obtained. 



Analysis. — 0-223 grm. gave 0*596 carbonic acid and 0-151 

 water. Centesimally, — 



Carbon 72'9 



Hydrogen .... 7'52 



agreeing closely with the formula C4 H-^ O, C,g H7 O3, as the 

 follow ing comparison of the theoretical with the experimental 



numbers shows : — 



Theory. Exjieriment. 



73-17 72-90 



7-31 7-52 



19-52 



100-00 

 When perfectly pure this compound is a colourless, fra- 



