350 Mr. Grove on the Gas Voltaic Battery, 



rent produced by these gases ; both the remaining oxygen and 

 the defiant gas were unaltered in character. 



Experiment 11. — Oxygen and carbonic oxide produced no- 

 table effects upon the iodide, and slight symptoms of decom- 

 posing water; a few bubbles gathered upon the electrodes of 

 an interposed voltameter ; the effects continued ; and at the 

 expiration of fifteen days, the following was the state of the 

 tubes in two cells, put aside as in the last experiment : — 



Rise of liquid in cells of closed 

 circuit, 



cubic inch. 

 In oxygen tubes . . . 0*12 

 In carbonic oxide tubes 0*93 



Rise of liquid in tubes of de- 

 tached pair, 



cubic inch. 

 In oxygen tubes . . . 0*02 

 In carbonic oxide tubes 0*7 



Rise of liquid apparently due to voltaic action, 

 In oxygen tubes . . 0*1 cubic inch. 

 In carbonic oxide tubes 0*23 



Before the battery was charged for this experiment, the 

 carbonic oxide had been carefully freed from carbonic acid by 

 caustic potash. After action, the liquid gave a slight precipi- 

 tate wilh lime-water, showing that carbonic acid had been 

 produced by the action. In this experiment the rise was more 

 uniform in the different tubes than in the last, and the action 

 more decided. The results, although on a small scale, appear 

 more definite ; thus we get the proportion as 1 : 2*3 ; and as 

 the combining volumes of oxygen and carbonic oxide are as 

 one to two, if we add the local action due to the oxygen of 

 the air in solution, 1 to 2'3 is as near an approximation as can 

 be expected. Though much superior to olefiant gas, the ac- 

 tion of carbonic oxide is, however, very feeble when compared 

 with that of hydrogen. 



Experiment 13. — Oxygen and chlorine. Very considerable 

 action on the iodide at first, but not constant; it abated within 

 the first hour, and after twenty-four hours the action was ex- 

 tremely feeble, scarcely perceptible; the water had risen nearly 

 to the top of the chlorine tubes, but the level in the oxygen 

 tubes was unaltered. The chlorine was negative to oxygen, 

 or in other words, the oxygen was in its voltaic bearing to 

 chlorine as hydrogen to oxygen. 



As in this experiment the water level in the oxygen tubes 

 was unaltered, it appeared that this gas had little to do with 

 the action, I therefore, 



Experiment 14, — Charged the alternate tubes of a battery 

 with chlorine and dilute sulphuric acid; the amount of action 

 was much the same as in experiment 13, and equally trans- 

 itory ; a few gaseous bubbles were perceptible on the plati- 

 nums in the oxygen cells, but not in sufficient quantity for 



