350 M. BerthoUet's Experiments on the Proportion [Nor. 



Weight of an atom. 



95 Columbium 18-000 



96 Oxide of columbium 19-000 "> 



97 Titanium 18-000 ? r 



98 Protoxide of titanium 19-000 ? 



99 Deutoxide of titanium 20-000 ? 



100 Peroxide of titanium 21-000 ? 



101 Ammonia 2*125 6 



I shall not continue this table any further at present, as I 

 conceive that the article has already extended to a sufficient 

 length. In the next number of the Annals, I shall give the 

 weight of the acids, and of such inflammable compounds as 

 have been analyzed with tolerable accuracy. I shall then pro- . 

 ceed to the salts, and to the vegetable and animal substances, a 

 few observations on the constitution of which I think may be 

 useful in the present state of Our knowledge. It may have a 

 tendency to prevent our indulging in theory before we have 

 •btained the requisite data. 



sten contains two-thirds of the oxygen of tungstic acid. Hence 

 the number for it in the table. 



q Little confidence can be put in the numbers in the table 

 which represent columbium and its oxide. If we suppose oxide 

 of columbium to be a compound of 1 atom metal + 1 atom 

 oxygen, and that it is composed of 100 metal -+- 5*5 oxygen, 

 the numbers in the table will result from the supposition. [Now 

 Berzelius found by experiment that oxide of columbium was a 

 compound of 100 metal -+• 5*485 oxygen. This I consider as a 

 very near coincidence. 



r These numbers are merely conjectural. 



s I consider it as demonstrated that ammoniacal gas is a 

 compound of three volumes of hydrogen and one volume of 

 azotic o-as reduced to two volumes. Now this is the same thine; 

 as if we said that it is a compound of three atoms hydrogen and 

 one atom azote. 



Article IV. 



Experiments on the Proportion of the Elements of Nitric Acid. 



By M. Berthollet* 



I have endeavoured, by a method hitherto neglected, to. 

 ascertain the proportions of oxygen and azote in nitric acid, 

 respecting which chemists are not agreed. 



* Translated from the Memoires d'Arcueil, vol. iii. p. [05. 



