192 Messrs. Thorpe and Young on the Combined Action 



II. 0-2638 grm. hydride gave 0*8119 grm, carbon dioxide and 

 0*3733 grm. water. 



III. An unknown quantity gave 0*5015 grm. carbon dioxide and 

 0*2318 grm. water, 









Found. 







Calculated, 



<— — — 



., A... 









I. 



II. 



III. 



c 7 ...... 



84*00 



84*29 



83*94 



84*14 





16*00 



16*13 



15*73 



15-86 





100*00 



100*42 



99*67 



100*00 



These six bodies, quintane and amylene, hexane and hexylene, heptane 

 and heptylene, are the only liquids we have been able to isolate from the 

 fraction boiling below 100°. Careful search was made for the other 

 hydrocarbons, particularly for benzol and for the hexylene of Caventou, 

 boiling about 80°, but without success. The fractions intermediate be- 

 tween 70° and 90° could be resolved by repeated distillations into pro- 

 ducts boiling at 65-70° and 90-100°. The amount coming over in the 

 neighbourhood of 80° was very small ; in fact the entire quantity even- 

 tually obtained between 70° and 90° amounted to only a few grams. About 

 a gram of the small portion boiling at 80-82° was treated with strong 

 nitric acid ; the liquid was very slowly acted upon, and when treated with 

 alcohol, zinc, and hydrochloric acid, after washing and solution in ether, 

 it failed to give the characteristic reaction for aniline ; nor on treating 

 the remainder of the hydrocarbon with excess of bromine, and allowing 

 the mixture to evaporate, could any solid bromide (C e H 10 Br 4 ) be obtained. 

 Hence we infer the absence of members of the O n Ho»_2 and C n H 2n _6 

 groups in the liquid hydrocarbons obtained by the decomposition of solid 

 paraffins. 



7. Fraction boiling between 100° and 200°.— -As this portion amounted 

 to about a litre, it was thought worth while to attempt a more rigorous 

 separation of the hydrocarbons than is possible by the ordinary method 

 of fractionation ; for this purpose a small condensing arrangement on 

 "Warren's principle was constructed, and by means of it the hydrocarbons 

 were separated at first at intervals of 10°, afterwards into portions boil- 

 ing between 5°, and eventually into portions boiling between 2°. The 

 hydrocarbons were distilled over sodium, and the temperature of the 

 worm was maintained about 20° lower than that of the vapour in the 

 flask. A considerable quantity of liquid was obtained boiling below 100° ; 

 and this could be resolved into hexane and hexylene, heptane and hepty- 

 lene. The amount of liquid eventually obtained between 100° and 120° 

 was very small. 



About 120 grms. of liquid were found to boil constantly between 

 122° and 125°. Bromine was eagerly absorbed by this fraction, indicating 



