338 EXPERIMENTAL INVESTIGATIONS. 



liquid, and yet, in consequence of their 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 hydrogen. In 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 respect- 

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



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

 tain 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. 



