EXAMINATION OF A NAPHTHA FROM LIME-SOA1 



1!'T 



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 h<ap in 

 question did, however, really contain two separate substances, being composed princi- 

 pally of a body (C20 H^) boiling at 174°-1 7 5° (corrected), or thereabout*, 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: 



0.2G89 grm. of the fraction 164°-165° gave 0.3038 grm. water, and 0.S264 grin, car- 

 bonic acid, or carbon 83.82 %, hydrogen J 2.53 %. 0.1345 grm. of the fraction 166°-167 

 gave 0.1609 grm. water, and 0.4157 grm. carbonic acid, or carbon 84.1 r k and hvd 

 gen 13.31 % ; another portion of 0.2732 grm. gave 0.3245 grm. water, and 0.8429 gi 

 carbonic acid, or carbon 84.15 % and hydrogen 13.18 %. 0.1734 grm. of the tract i 



acid 



carbon 81.20* 



170°-171° gave 0.2118 grm. water, and 0.535 grm. carbonic 



and hydrogen 13.55 %. 



Despairing of being able to find any central point in this heap, and acting upon 



furnished by the aforesaid depression, at 167 



168 



proceeded to purify 



examine fractions at each of the extremities. The fractions 170 o -171° and 17F-1 



were treated in the usual w r ay with diluted sulpl 



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 



The hydro-carbon itself finally becomin 



dark-colored, the acid treatment was stopped, and the hydrocarbon, washed 

 and alkali, was dried over hydrate of potash and boiled repeatedly upon sod 



As thus purified it boiled at 174.6 



ected) 



On combustion, 0.1706 grm. of it gave 0.214 grm. water, and 0.5373 grm. carbonic 



acid, or 



Carbon 

 Hydrogen 



Found. 



85.93 

 13.95 



Theory. 



C20 85.71 

 H20 H.29 



99.88 



100.00 





A determination of the density of its vapor gave the following result 



Temperature of the balance, 



no 



Temperature of the oil-bat! 

 Excess of weight of balloon, 



Capacity of balloon, 



* 



25 

 229° 



0.4714 grm 

 208 c. c. 



