494 



DR EDMUND RONALDS ON THE MOST VOLATILE 



acid and oxygen, little difference in composition from that already analysed, and 

 which had been collected from the surface of the crude oil. 



I omit the details of the analyses of these two, and submit only the results, 

 which correspond in both cases with a mixture of the hydrides of ethj^ and 

 propyl. 



Gas. Condensation. Carbonic Acid. 



8-289 : 22-947 : 19-045 



100 : 2-77 : 242 

 Oxygen consumed 32*338. 



7-275 : 20-70 : 17-586 



00 : 280 : 240 



Oxygen consumed 31 07 



I. {8- 



11. {^t 



The gas coming over a little later from the same liquid was found to approach 

 nearer in composition to pure hydride of propyl, as is shown by the following 

 analysis. This portion was treated with potash before being introduced into the 

 eudiometer, but the oxygen which it contained was not separated before combus- 

 tion, but was estimated in a separate experiment, and found to amount to 2-44 

 per cent, of the gas burned. 



Gas, 



After addition of oxygen, . . 

 After addition of air, . . . 



After explosion, 



After absorption, .... 

 After admission of hydrogen, . 

 After explosion, 



Observed 

 Volume. 



39-723 

 160- 

 260-128 

 236-386 

 204-386 

 357-161 

 231-225 



Pressure. 



0-2817 



0-3939 



0-4917 



0-4680 



0-451 



0-602 



0-4643 



Temperature. 



15-1 



16- 



14-5 



16-5 



15- 



14- 



13-6 



Corrected vol. 

 at 0° + 1 m. 



l^ressure. 



10604 

 59-548 

 121-46 

 104-33 

 87-376 

 204-53 

 102-29 



Deducting the nitrogen and the 2-44 per cent, of oxygen contained in the gas, 

 we have here the ratio of hydrocarbon to condensation and carbonic acid, as 



5-984 

 100 



17-13 

 286 



16-954 

 283 



Hydride of propyl 03!!^ = 2 vols., requires a ratio of 1 : 3 : 3. 



The quantity of oxygen consumed by the hydrocarbon is 4-67 times its 

 volume, while pure hydride of propyl would require 5 times its volume. 



The gas collected at a still later period from the same liquid was free from 

 carbonic acid, oxygen, and nitrogen gases, and agreed in composition with a 

 mixture of the hydrides of propyl and butyl. 



