EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 183 
ucts at 35°-41°, a heap was obtained at 644°-664,> which, roughly estimated, amounted 
to about 250 ¢.c. This heap was well defined, the quantities obtained for each degree 
above it diminishing rapidly towards 70,° while on the other side the fractions fell 
away to almost nothing at 63.° At.70°-71° was another well-marked though smaller 
elevation, amounting to about 180 ¢.¢. This diminished rapidly on either hand, but 
especially on the side towards 80.° The product at 70°-71° had an odor like petro- 
leum, quite unlike the odor of acetone, possessed by the fraction 92°-93,° or the odor 
of the fraction 643°-654°, which though hardly to be compared with that of acetone 
still reminded one of the latter. Each of the fractions between 644° and 72° was 
separately treated with diluted sulphuric acid and subsequently boiled over sodium. 
The sodium was at first acted upon to a considerable extent, even in the cold, but after 
three or four redistillations this action ceased almost entirely. The dark sulphuric acid 
liquor from 70°-71° evolved no such ethereal odor as did that from 92°-93°. 
The purified fractions between 644° and 72,’ were now all redistilled some eighteen 
times through Warren’s hot condenser, new fractions being taken off for every half 
degree. The thermometer employed was graduated to fifths of a degree, and the most 
scrupulous care was constantly exercised, in the belief that the two heaps might be 
made to coalesce into one. But the longer the distillatory process was conducted so 
much the more clearly did the two heaps stand out, their summits being respectively 
at 64°-65° and 67°-68°. About one-half of the material taken for purification 
wasted away during the operations here recorded. 
Allowing for the elevating influence of the second (68°) body, we estimate the true 
(corrected) boiling point of the first, when pure, to be 65°. 
On combustion, 0.1896 grm. of the purified fraction 654°-66°, gave 0.254 grm. 
water and 0.5921. grm. carbonic acid; another portion, not weighed, gave 0.2978 grm. 
water, and 0.7085 grm. carbonic acid, or 
Found. Theory. 
I. II. 
Carbon 85.18 85.37 Cig (85.71 
Hydrogen 14.87 14.63 Hig 14.29 
100.05 100.00 100.00 
A determination of the vapor density of the hydro-carbon boiling at 652°-66°, af 
forded the following result. 
Temperatureof balance, - 6 ee ee 18 
Temperature of oil-bath,h «© 6 6 6 ee 128° 
Excess of weight of balloon, . . «. . re ee a ee 0.2965. 
