296 
A NEW PROCESS IN EUDIOMETRY. 
When we have arrived at this point of the experiment, 
the gaseous residue is passed into the graduated tube for 
the purpose of measuring it, taking the precautions requi- 
site in these kinds of operations. In the various experi- 
ments we have made, by employing the method we sub- 
mit to the notice of chemists, the gaseous residue, after hav- 
ing been subjected to the action of the copper and ammo- 
nia, contains no trace of oxygen ; for if phosphorus be in- 
troduced to detect it, it gives out no phosphorescent light 
in darkness, nor does it produce any diminution of its 
volume. 
The volume of the nitric gas determined by this process, 
has always been two or three tenths of a degree greater 
than that obtained by the action of phosphorus upon the 
air. The proportion has been 79 : 792-2. The latter 
number deduced from our experiment, comes very near 
79*17, which MM. Dumas and Boussingault have deduced 
from the most laborious analysis of the air. 
When analysing an artificial mixture, composed of 41*5 
air, and 57-5 nitrogen, in which the proportion of nitrogen 
is necessarily increased to 90-2, the new method indicates 
90 of nitric gas. 
The simplicity of this operation, and the short time in 
which it can be performed, will enable us, without doubt, 
to employ it in various cases.- -Ibid, from Comptes Ren- 
dus. 
