PROFESSOR GRAHAM ON THE MOTION OF GASES. 
623 
Carbonic oxide and nitric oxide, with equal admixtures of hydrogen, correspond 
as closely in their times as when pure, as will be seen on comparing together the 
results of Tables XLV. and LIII. A similar apparent rectification of the time of 
nitric oxide will be observed, in the last of these tables, to be effected by the addition 
of 5 per cent, of hydrogen to that gas, as was remarked above of carburetted hydro- 
gen ; the time of 100 N0 2 being 0'8661, that of 95 N0 2 + 5H is found Q‘8788 ; while 
the empirical coefficient for nitric oxide is the same as that of nitrogen, namely, 
0‘8750, or 0’8785, adopting Regnault’s density of the latter gas. 
It appears that the time of carburetted hydrogen is sensibly increased by the 
addition of oxygen, at least when the proportion of the latter gas amounts to or 
exceeds 25 per cent, of the mixture (Table LIV.). 
The times of transpiration of the hydrogen mixtures, which have been most 
minutely observed, namely, those of hydrogen with oxygen, with air, and with car- 
bonic acid, are exhibited by the curves of Plate XXXV. These curves start from 
a common point 44, the time of pure hydrogen, and terminate respectively with the 
times of oxygen 100, of air 90, and of carbonic acid 75. 
It would be premature to enter at present upon any discussion of these results 
for the full elucidation of the transpiration of mixed gases, must await, I believe, 
the further extension of our knowledge of the laws of gaseous diffusion. Nov. 1846.] 
