118 Mr. Grove on the Effect of 



Hydrogen is however so far removed from botlf oxygen and 

 nitrogen in its effects upon the ignited wire, that in order 

 more accurately to ascertain the relative position of the latter 

 two gases, I made a few further experiments on them as con- 

 trasted with each other, and not with hydrogen. I first re- 

 peated my former experiment on these two gases, varying it 

 only by changing the circumstances in the manner suggested 

 by the present experiments, which on account of the vessel 

 containing the wire being immersed in a given quantity of 

 water, instead of being exposed to the external atmosphere, 

 would occasion greater equality in the surrounding cooling 

 effects, and would give me the opportunity of combining both 

 methods in one experiment. 



I filled both tubes A and B with oxygen, and included a 

 voltameter in the circuit ; in two minutes 3"43 cubic inches of 

 hydrogen were evolved in the voltameter, and the thermometer 

 in each cell had risen from 60° to 63°. A similar experiment 

 with nitrogen gave in two minutes 3-4 cubic inches of hydro- 

 gen, and the thermometer rose from 60° to 63°. 



This experiment accords with my previous one as to the 

 voltameter test, but indicates no difference in oxygen and 

 nitrogen with the thermometer test; I therefore in the fol- 

 lowing three experiments associated nitrogen with oxygen in 

 the apparatus, fig. 1. All things being disposed as with the 

 experiments on hydrogen associated with other gases, in five 

 minutes the thermometer rose — 



In the oxj'gen. In the associated nitrogen. 



Exp. 1st. From 60° to 71°-5. From 60° to 73°. 



2nd. 60° to 77°. 60° to 76°. 



3rd. 60° to 75°. 60° to 7G°. 



Mean ... 60° to 74;°-5. 60° to 75°. 



The battery had increased somewhat in power after the 

 first experiment, but as both wires formed part of the same 

 circuit in each experiment, the variations in battery power do 

 not affect the comparative results. The second experiment 

 gives a variation in the position of oxygen and nitrogen with 

 i-eference to the first and third experiments, but the gases so 

 nearly approach in their cooling effects, that these slight dif- 

 ferences are not much to be relied upon; however I applied a 

 further test. I associated in turn oxygen and nitrogen with 

 carbonic acid ; the following were the results. In five minutes 

 the thermometer rose — 



