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Intelligence and Miscellaneous Articles. 



tained. The gas evolved by the second voltameter was conveyed by a 

 glass tube to the bottom of a test-tube containing the 50 cubic centi- 

 metres of the solution of arsenious acid ; this glass tube was recurved 

 at its extremity, and the bubbles of gas escaping from it were received 

 in a funnel immersed in the fluid. The narrow portion of this fun- 

 nel was also recurved, so as to compel the gas to pass twice through 

 the arsenious acid. 



Notwithstanding the adoption of this method to effect a more 

 complete absorption, the gas which had passed still possessed an 

 odour of ozone, and there is reason to believe that a considerable 

 portion escaped the action of the arsenious acid. The results here 

 given are consequently by no means maximum determinations. 



The liquid placed in the voltameters was pure sulphuric acid 

 diluted with six times its volume of water, excejit in two experi- 

 ments, M'hen chromic acid was employed. In the first experiments 

 the voltameter was composed of a rather small bottle, so that it 

 rapidly became heated by the passage of the current, and it was dif- 

 ficult to keep it at a low temperature. It was afterwards replaced 

 by a larger vessel. 



One or two experiments were made without cooling the volta- 

 meter, in the rest it was suiTounded by a mixture of ice and common 

 salt. The ixsults are given in the following table : — 



— Comptes Rendus, March 6, 1854, p, 445. 



