266 PROCEEDINGS OF THE AMERICAN ACADEMY. 



(11.) 1.22. A combustion of the crude oil gave, 84.96 per cent of carbon 

 and 11.96 per cent of hydrogen. Two determinations of bromine absorp- 

 tion gave, (I.) 18.8, (II.) 18.3 per cent. 



A distillation of 1346 grms. of the crude oil under atmospheric jjres- 

 sure gave the following weights : — 



-100° 100=-150° 150^-200° 200='-2o0=' 



167 170 132 130 Grms. 



The small proportions distilling below 250° made it evident that the 

 chief constituents could only be separated in vacuo. The specific 

 gravity of these distillates at 20° were ascertained by weighing on a 

 Westphal balance : — 



100° 100°-150° 150°-206° 



0.7642 0.8155 0.8538 



Ten litres of the Puente crude oil, after collecting below 150° at 

 atmospheric pressure, gave the following weights under 50 mm : — 



150 At. Pr. -120° 120°-lo0° 150°-175° 175°-185° 185^-200° 



590 800 827 990 160 495 Grms. 



The residue above 200° was next divided into fractions of convenient 

 size without noting temperatures : — 



1. 2. S. 4. 



655 1010 670 430 Grms. 



Further distillation of the fraction -150 At. Pressure gave the follow- 

 ing weights : — 



-60'= 60^-62^ ee^-eS^' 78-"'-82° 88°-90° 96^-98^ 109^-110'^ 118°-120° 



10 10 10 27 40 120 60 65 Grms. 



Smaller weights collected at intermediate temperatures. 



HePTAMETHYLENE, C7H14. 



No attempts were made to ascertain the composition of the individual 

 fractions below 96° from Puente oil. Those portions will receive 

 further attention with the corresponding distillates from the other oils. 

 Without purification the distillate 96°-98° gave as its specific gravity 

 at 20°, 0.7499. After repeated agitation with fuming sulphuric acid 

 and potassic hydrate, the specific gravity was scarcely changed, 0.7440 ; 



