116 Mr. Grove on the Effect of 



liquid, and yet, in consequence of tlieir being surrounded by 

 a thin envelope of different gases, a large portion of the heat 

 which is developed in the one portion appears to have been 

 annihilated in the other. Similar experiments, varying the 

 gas in one tube while hydrogen was retained in the other, 

 gave the following results. In five minutes the thermometer 

 rose — 



In the hydrogen. In the associated nitrogen. 



1st. From 60° to 69°- 5. From 60° to 81°-5. 



In hydrogen. In carbonic acid. 



2nd. From 60" to 70°-5. From 60° to 80°. 



In hydrogen. In carbonic oxide. 



3rd. From 60° to 70°. From 60° to 79°*5. 



In hydrogen. In olefiant gas, 



4th. From 60° to 70°-.5. From 60° to 76^-5*. 



On a different day I tried the following experiments ; all 

 the circumstances were the same, excepting that the battery 

 was in more energetic action, for which reason I have not 

 tabulated them with the others. 



In oxygen associated with coal gas the thermometer rose In 

 five minutes — 



In oxygen. In coal gas. 



From 60° to 82°. From 60° to 76°. 



In hydrogen associated with coal gas the thermometer rose 

 in five minutes — 



In hydrogen. In coal gas. 



From 60°'to 77°. From 60° to 82°'5. 



From this it would appear that coal gas should be placed, as 

 to its cooling effect on the ignited wire, between hydrogen 

 and olefiant gas. 



On another day sulphuretted hydrogen associated respec- 

 tively with oxygen and hydrogen was tried ; the wire in the 

 sulphuretted hydrogen was at first ignited to a degree some- 

 what inferior to that in oxygen, but the gas was rapidly de- 

 composed ; sulphur being deposited on the interior of the 

 vessel and the intensity of ignition gradually decreased, so as 

 ultimately to be scarcely superior to the ignition in hydrogen : 



* I should perhaps remark, that several test experiments were tried to 

 ascertain the working of the apparatus ; thus, the same gas was placed in 

 both tubes, and the results given by the thermometer were found to be 

 accurately the same in both vessels. The tubes were also changed with 

 reference to the containing vessels and to the contained gases. The water 

 was always agitated to render its temperature uniform previously to reading 

 off, &c. &c. 



