EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 197 
being about as large as the others, and with the exception of its unusual lateral 
extension and of a slight depression at the fraction 167°-168° there was nothing in 
the appearance of the heap to denote any one of its component fractions as the point 
of culmination, or to indicate the presence of more than one body. The heap in 
question did, however, really contain two separate substances, being composed princi- 
pally of a body (Cx Hz) boiling at 174°-175° (corrected), or thereabouts, together 
with a quantity of isocumole the boiling point of which is at 170°, as has been shown 
by one of us. 
Analyses of several of the unpurified fractions afforded the following results :— 
0.2689 grm. of the fraction 164°-165° gave 0.3038 grm. water, and 0.8264 grm. car- 
bonic acid, or carbon 83.82 %, hydrogen 12.53 %. 0.1345 grm. of the fraction 166°-167° 
gave 0.1609 grm. water, and 0.4157 grm. carbonic acid, or carbon 84.12 % and hydro- 
gen 13.31 % ; another portion of 0.2732 grm. gave 0.3245 grm. water, and 0.8429 grm. 
carbonic acid, or carbon 84.15 % and hydrogen 13.18 %. 0.1734 grm. of the fraction 
170°-171° gave 0.2118 grm. water, and 0.535 grm. carbonic acid, or carbon 84.20 %, 
and hydrogen 13.55 %._ 
Despairing of being able to find any central point in this heap, and acting upon the 
hint furnished by the aforesaid depression, at 167°-168°, we proceeded to purify and 
examine fractions at each of the extremities. The fractions 170°-171° and 171°-172° 
were treated in the usual way with diluted sulphuric acid. The first two portions of 
acid blackened very much; the third, fourth, fifth and sixth also became dark, but each 
less so than the portion which preceded it. The hydro-carbon itself finally becoming 
dark-colored, the acid treatment was stopped, and the hydro-carbon, washed with water 
and alkali, was dried over hydrate of potash and boiled repeatedly upon sodium. 
As thus purified it boiled at 174.6° (corrected). 
On combustion, 0.1706 grm. of it gave 0.214 grm. water, and-0.5373 grm. carbonic 
acid, or 
Found. Theory. 
Carbon 85.93 Coo 85.71 
Hydrogen 13.95 Hap 14.29 
99.88 100.00 
A determination of the density of its vapor gave the following result :— 
Temperature of the balance, - ~. .« de Sk US at ES G8) Gio Se car at “20? 
Temperature of the oil-bath,. —. oe. a8, +f a a a a ee 229° 
Excess of weight of balloon, . . 6 ee ee 0.4714 grm. 
Capacity of balloon, © 6 ee 208 c.¢. 
