458 
ME. C. GEEVILLE WILLmiS OX S03IE OF THE PEODUCTS 
between 199° and 202°. The following is a combustion of the fluid distilling at that 
temperature : — 
T578 gramme caproyle gave *4897 carbonic acid and ‘2238 water. 
Experiment. Calcnlation. 
Carbon . . . 84‘6 C 144 84‘7 
Hydi-ogen . . . 15-8 26 15-3 
170 100-0 
The results of the analysis of this radical by other observers are as follows : — 
Beaziee and GtOssleth. Weetz. 
^ A ^ 
84-49 84-54 84-25 
15-60 15-44 15-49 
A determination of the vapour-density proved that the fraction boiling at 202° had 
not only the per-centage composition, but exactly the same condensation as the radical 
caproyle, thus: — 
Excess of weight of balloon . . . -8021 grm. 
Temperature of vapom* .... 231° 
Temperature of air 15° 
Pressure 739-4 mm. 
Capacity of balloon 283-0 cub. cent. 
Eesidual air 1-0 cub. cent. 
Density 5-83 
The formula C^"* requires — 
24 volumes carbon vapour 
52 volumes hydrogen . 
0-8290.24=19-896 
0-0692.52= 3-598 
23-494 
=5-8735 
4 
Experiment. Weetz. 
5-83 5-983 
Theory. 
5-8735 
It was found that as the radicals of higher boiling-point were reached, greater diffi- 
culty existed in getting rid of the last traces of nitrocompound: although repeated!}' 
washed with monohydrated nitric acid to remove any that might remain in solution, and 
then with strong potash, the radical so obtained did not, at flrst, distil perfectly colour- 
less, and, moreover, retained a slight odour of the nitrocompound. The fluid in this 
condition left a yellow residue on distillation. A few rectifications over sodium entfr-ely 
removed the impurity, and the radical as analysed above was perfectly colourless and 
almost inodorous. Its density at 18° was 0-7568. Wurtz found it at 0° 0-7574. 
Messrs. Brazier and Gossleth do not state the density of the caproyle analysed by them. 
