Mr. Noad on the Action of Nitric Acid on Cijmol. 27 

 baryta = 30*54 per cent. bar3'ta, corresponding with the for- 

 mula BaO, Cie"^ lyr^j fOg, as may be seen by the following 



comparison : — 



Theory. Experiment. 



1 equiv. Anhydrous acid l7l"50 69*24 

 1 ... Baryta . . . 76-66 30-76 30-54 



248-16 100-00 



Nitrotoluylate of Silver. — This salt was formed by dropping 

 nitrate of silver into a neutral solution of nitrotoluylate of 

 ammonia ; it fell as a white curdy mass resembling chloride 

 of silver. It is soluble to a considerable extent in hot water, 

 and by long boiling becomes partially decomposed ; it cry- 

 stallizes from a hot aqueous solution in beautiful feathery 

 tufts ; it is only sparingly soluble in alcohol. 



By combustion with oxide of copper the following results 

 •were obtained : — 



I. 0-3505 gi-m. gave 0-424 grm. cai'bonic acid and 0'070 

 water when ignited alone. 



II. 0*3385 grm. gave 0*127 grm. of silver. 



III. 0*230 grm. gave 0'086 grm. silver. Centesimally : — 



I. II. III. 



Carbon . . 33-0 

 Hydrogen . 2*12 

 Silver 37*52 37*38 



corresponding with the formula AgO, Cig-^ ^^ > O3. 



Theory. Experiment. 



16 equivs. Carbon 

 6 ... Hydrogen 

 1 ... Nitrogen . 

 8 ... Oxygen 

 1 ... Silver . . 



1 ... Nitrotoluylate Uss lOQ-OO 

 or silver .J 



I have already mentioned that I prepared a small quantity 

 of campliogcne by the action of anhydrous phosphoric acid 

 on camphor ; in order to obtain an additional experimental 

 proof of the identity of this substance with cymol, I have 

 studied the action of concentrated nitric acid on it. I found 

 it most convenient to prepare a silver salt of the acid thus 

 obtained, the analysis of which yielded me the following 

 ■numbers : — 



