454 
ME. C. GEEVILLE WILLIAMS ON SOiME OF THE PEODECTS 
means than those adopted for the preparation of the radicals ; the details of the method 
belong to a series of experiments to be given in Part II. It is to be understood, there- 
fore, that the nitric acid process was adhered to for the isolation of the bodies described 
in this paper. 
After preparation of the butyle, I proceeded to determine the vapour-density of the 
fractions, the results being embodied in the annexed Table. 
Vapour-densities of fractions from 104° to 129°, after treatment vyith nitric add, d'c. 
Boiling-point. 
Excess 
of weight of 
baUoon. 
Temperature 
of vapour. 
Temperature 
of air. 
Pressure. 
Capacity 
of 
balloon. 
Residual 
air. 
Density. 
grm. 
mm. 
cub. cent. 
cub. cent. 
104 to 107 
•5332 
154 
19° 
752 
298-5 
•5 
3-63 
104 to 110 
•4365 
171 
16 
752 
268-0 
5-0 
3-66 
107 to 110 
•5030 
163 
16 
761 
281-5 
1-5 
3-73 
110 to 116 
•4950 
173 
16 
761 
277-5 
2-0 
3-82 
121 to 127 
•5489 
179 
18 
760 
274-5 
0-0 
4-11 
126 to 129 
•5545 
160 
14 
750 
268-5 
2-3 
4-09 
It was evident from the foregoing determinations, that the boiling-point of the hydro- 
carbon having the formula C*® was between 116° and 121°, but this being higher 
than was anticipated, it appeared probable that the fractions used had not been treated 
sufficiently with nitric acid : a portion of somewhat lower boiling-point than those in 
the Table was therefore repeatedly acted on until the impurity was entirely removed, 
and the separated acid, on being diluted with water, yielded not the slightest milkiness. 
The annexed were the results obtained with the hydrocarbon so purified : — 
Portion distilling, Portion distilling, 
100° to 101°. 101° to 103°. 
Temperature of air . . . 
17° 
17° 
Temperature of vapour 
. 145° 
148° 
Pressure 
. 776-2 mm. 
776-2 mm. 
Excess of weight of balloon 
. -5545 grm. 
-5305 grm. 
Capacity of balloon . . . 
308 cub. cent. 
295 cub. cent. 
Residual air 
. 4-5 cub. cent. 
5-0 cub. cent. 
Density of vapour . . . 
. 3-63 
3-66 
The repeated treatment with nitric acid, although it had the effect of raising the 
density, did it to so slight a degree, that it was clear the boiling-point of butyle from the 
Torbane-hill mineral was much higher than that found by other observers, and lay 
between 116° and 121°. Analysis gave the numbers annexed: — 
I. -3325 butyle gave 1-0246 carbonic acid and -4704 water. 
II. -1783 butyle gave -5505 carbonic acid. 
III. -1841 butyle gave *5673 carbonic acid and -2604 water. 
IV. -1687 butyle gave -5189 carbonic acid and -2421 water. 
