194 EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 



water, and 0.5687 grm. carbonic acid (I.). Another portion, not weighed, gave 0.2398 

 grm. water, and 0.5647 grm. carbonic acid (II). Or, 



Found. 

 I. II. 



Carbon 84.80 85.27 

 Hydrogen 14.76 14.73 



99.56 100.00 



From these analyses the improbable formulae C 16 H 167 and C 16 H 166 are derived. 

 The excess of hydrogen, however, indicates the presence of a member of the hydride 

 series, and to obtain this the degree-fractions about 128° were treated with mono- 

 hydrated sulphuric acid. The first and second portions of acid blackened instantly 

 and much viscid matter was deposited ; heat was also evolved. The third, fourth, fifth, 

 and sixth portions of acid each became less black than the preceding portion ; but a 

 large proportion of the hydro-carbon disappeared during this treatment. The opera- 

 tions of washing, drying, and boiling with sodium were conducted in the usual way. 



On combustion, after this treatment with strong acid, 0.1253 grm. of the hydro- 

 carbon gave 0.1746 grm. water, and 0.3895 grm. carbonic acid. Or, 



round. 



Carbon 84.75 

 Hydrogen 15.48 



Theory. 



Cie 84.2 

 His 15.8 



100.23 



100.0 



The upper portion of this heap consequently contains hydride of capryl, the true 

 boiling point of which is 128°-129°. 



Xt/loZe=zC 16 H 10 . Between 140° and 144° was a large heap of 840-850 c. c, 

 the well-defined summit of which was at 142°-142F. Upon either side of this point 

 the size of the degree-fractions rapidly diminished, these being all very small below 

 140° and above 144°. 



The fraction 142°-142£° was treated at once with monohydrated sulphuric acid, the 

 first portion of which became very dark and viscid, some heat being at the same time 



ed 



the second and third portions of acid also became very dark, though 



viscid than the first; the fourth portion of acid became somewhat dark, and the hydro- 



■ 



carbon itself now began to be colored, and the odor of sulphurous acid was per- 

 ceptible. 



After having been washed and dried in the usual way, the hydro-carbon was redis- 



of 



ed through Warren's hot condenser, when it appeared that, by comb 

 portion of the hydro-carbon with the elements of sulphuric acid, there had been formed 



