
TAKING THE DENSITY OF VAPOUR OF VOLATILE LIQUIDS. 459 
of nitric acid upon alcohol, according to the directions of the hand-books, urea 
being added to destroy any peroxide of nitrogen. The ether was washed, dried 
by standing in contact with carbonate of potash, and afterwards distilled in the 
water-bath. 
‘1869 grm., on ignition with oxide of copper and copper turnings, gave °1754 
erm. of carbonic acid and ‘0975 germ. of water. 
No solid potash was employed in conjunction with the potash bulbs, where- 
fore the slight deficiency in the carbonic acid may be fairly ascribed to the passage 
of nitrogen gas. 
Here are the results of the combustion compared with the formula of nitrate of 
_ ethyl, a: } O, requires :— 

Calculated. Found. 
eEeo—oe ow eo 
Carbon, : : DY XG 7/ 25°60 
Hydrogen, 2 ‘ 5 5°50 5°80 
Nitrogen, 5 3 14 =16°38 
Oxygen, : : 48 62°75 
91 100-00 
The vapour-density determination was made by the modification of Gay- 
Lussac’s method. The gas employed as the diluent was dry nitrogen. 
‘0786 grm.= amount of substance taken. 
Corrected Vol. 











Observed vol. T t C Pressure in in Cubic Cent. 
in Cubic Cent. eas Millimeters. reduced to 0° C. 
and 760 m. m. 
Vol. of Nitrogen ‘ : 45:28 12:9° 575:8 82°758 
Vol. of eke + Mapes \ 79.31 85-5? 6603 59-484 
—Obs. 1, , 
The same—Obs. 2, : 80°30 90° 6618 52-598 
The same—Obs. 38, : 76°84 70°3° 656°4 52-784 
The same—Obs. 4, : 15:67 649° 654:°9 52'692 



0:2 cub. cent. to be subtracted from the corrected volume at 0° C., and 760 m. m., 
being the correction for air introduced in the bulb containing the nitrate of ethyl. 
C. Vapour Densities. 
Obs. 1 at 85:5" : : 3112 
”? 2 ” 90° . f . 3094 
” 3 ” 70°3° : 5 ‘ 3°065 
” 4 ” 64:9° : . a 3°079 
C,H, ; 1 ere / ; 
NO, { 02 requires 3% ‘0691=3:144, which is sufficiently near the experimental 
4 
density. 
