234 Dr. J. H. Gladstone on the Want of Uniformity In 



mainly confined to determining the substances remaining in 

 solution, i. e. the nitrous acid and the ammonia. 



The following Table gives the results; they represent in 

 each case the amount produced by one gramme of metal, 

 mixture, or alloy, as the case may be. Usually 0*4 gramme 

 was dissolved in nitric acid, and the resulting solution was 

 divided into two equal parts for determining the nitrous acid 

 and ammonia respectively. The figures given in the Table 

 are the mean of several observations, which were generally 

 fairly accordant, calculated for one gramme. To these are 

 added the results of two specimens of commercial brass of 

 higher percentage of copper. 



Table I. 



Products of Reaction, calculated for 1 gramme. 



Substance. 



Nitrous acid. 



Ammonia. 





0057 



00164 







Cu 20 - 5 per cent., Zn 79 - 5 percent. : j a p oy 



0-165 00275 

 0-185 00098 



i 



Cu 38-38 per cent., Zn 61-62 per cent. : j Soy"" 6 "' 



0-270 

 0-552 



0-0192 

 trace 



Ou 49-1 per cent., Zn 509 percent.:] j. 



0-431 

 0-568 



00130 

 trace 



Cu 65 - 8 per cent., Zn 335 per cent. : alloy 



0568 



trace 



Cu 73 - 5 per cent., Zn 26'5 per cent. : allov 



0-600 



trace 





0-605 



trace 





If the copper and zinc in the proportions above mentioned 

 had been dissolved separately in acid, and their solutions then 

 mixed together, nitrous acid and ammonia might have been 

 expected to be in the following proportion : — 



Table II. 



Mixture of Solutions. 



Nitrous acid. 



Ammonia. 



Cu 20-5 per cent., Zn 79'5 per cent 



Cu 33-38 per cent., Zn 6 1'62 per cent. 



Cu 49'1 per cent., Zn 50'9 percent 



0-169 

 0-267 

 0-326 



0-0130 

 00101 

 00083 



