166 



Prof. J. Dewar. 



[Feb. 12, 



I. II. 



Weight of acid taken '2835 "209 



Carbonic acid produced ' 640 '473 



Water 0*134 "099 



Calculated in percentages — 



Carbon . . 

 Hydrogen 



I. II. 9 H 9 NO; 



61-5 .... 60-5 .... 60-33 ' 

 5-2 .... 5-16 .... 5-02 



Silver salt — 



Weight of salt 



Carbonic acid produced 



Water 



Silver ... 



I. II. 



0-2295 .... 0-3235 



0-292 .... 0-454 



0-054 0-078 



0-100 .... 1375 



Calculated in percentages, the results are — 



I. II. C H 8 AgNO 8 . 



Carbon 34 7 ... . 34 *89 ... . 37 76 



Hydrogen 2 "61 2 '68 ... . 2 79 



Silver 43-56 .... 42'5 .... 37 76 



A quantity of the silver salt which had been treated with dilute 

 nitric acid, weighing 0*186, gave 0"081 of silver, or equivalent to 43*5 

 per cent. A sample recrystallised, weighing 0*1492, gave 0*0655 of 

 silver, or 43*9 per cent. The second fraction, obtained by partial 

 precipitation from the ammonia salt amounting to 0*3033, gave 0*1343 

 of silver, or 44*2 per cent. The mean of the five analyses giving 

 43*5 per cent, of silver. Nitrogen determination.: — The nitrogen was 

 found on combustion to bear to the carbonic acid the relative volume 

 ratio of 1 to 18*3. 



The above analyses of the silver salt prove that it always contains 

 excess of silver, either from a higher substitution product, or from 

 combined oxide. The composition might be represented by eight equiva- 

 lents of the normal silver salt combining with one of oxide of silver. 

 Although the want of material prevented the examination of a greater 

 number of salts, there can be little doubt that the composition of the 

 acid is C 9 H 9 TTO 3 . 



The acid fused with caustic potash gives aniline, and the silver salt 

 when heated gave a crystalline sublimate with drops of aniline. 



The acid dissolves in hot glycerine with a fine violet fluorescence, and 

 begins to decompose, giving oft 1 carbonic acid at 180°, together with oily 

 drops of aniline. 



