EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 193 



developed together with an ethereal odor. The first portions of the diluted acid 

 became dark-colored and rather thick; but the fifth and last portion of acid \ is but 

 little colored, though still by no means colorless. After washing with a solution of 

 caustic alkali, and drying over sticks of hydrate of potash, it was found necessary to boil 

 the product with sodium during a long time, and to distil it repeatedly from the sedi- 

 ment which formed, before its action upon this metal became in some degree moderate. 



The dark sulphuric acid liquor became turbid, as usual, when mixed with water, and 

 evolved an agreeable ethereal odor. 



Distilled over sodium from an ordinary retort, the boiling point of the purified trac- 

 tion 123°-124° was 125.2° (corrected); and that of the fraction 121°-122 5 was L2&8" 

 (corrected). 



On combustion, 0.2278 grm. of the purified fraction 123°-124° gave 0.2994 prm. 

 water, and 0.7114 grm. carbonic acid (No. I.). Another portion of 0.19 grm. gave 

 0.2504 grm. water, and 0.5917 grm. carbonic acid (No. II.). 



Analyses of the purified fraction 121°-122° afforded the following results: 0.1894 

 grm. of the hydro-carbon gave 0.2466 grm. water, and 0.5925 grm. carbonic acid (Xo. 

 III.). Another portion, not weighed, gave 0.1685 grm. water, and 0.406 grm. carbonic 

 acid (No. IV.). Or, 



Found. Theory, 



I. II. IU. IV. 



Carbon 85.16 84.95 85.32 85.55 . Cie 85.71 



Hydrogen 14.62 14.63 14.47 14.45 - Hl6 14.29 



^I^H^MM^^^^B^V^^V^^V w^^b ^^^^^^^^^^^^^^V^^^B ^^^^^^^^^^^^^^™^*^^^M^^^ ^^^^^^^^^^^^^^^^"^v * 



99.78 99.58 99.79 100.00 100.00 



A determination of the vapor density of fraction 123°-124° gave the following 

 result : — 



99O 



Temperature of balance, 



" " oil-bath, . 178 ° 



Excess of weight of balloon, * • ^ 



Capacity of ".....••••**•* 



Air remaining in " ..•••• 



Height ot barometer, 



n \ , , , 3.9756 



Density of vapor found, ♦ ..•••••• 



3 873 

 " " theoretical (Cie Hie), 



The sp. gr. of fraction 123°-124* was 0.7396 at 0° ; that of fraction 12F-122 

 was 0.7433 at 0°, 0.735 at 12°, 0.7321 at 15°, 0.7305 at 17°. 



After treatment with diluted sulphuric acid, the fraction 125>-126° afforded the fol- 

 lowing results on being analyzed: 0.1829 grm. of the hydro-carbon gave 0.2432 grm 



vol. ix. 29 



