370 mSOXIDATIOI^ or IROW by HIDROGEV OAf. 



in the arteries was very little more florid than that in the 

 reins; the thermometer in the rectum had fallen to 93®. 

 The gum bottle was then reraoTcd. On causing a stream of 

 the gas, which it contained, to pass through lime water, 

 the presence of carbonic acid was indicated by the liquid 

 being instantly rendered turbid. The proportion of car- 

 bonic acid was not accurately determined ; but it appeared 

 to form about one half of the quantity of gas in the bottle. 



B. C. BRODIE. 



IX. 



Notes hy Mr. J; H. Hassenfratz on the Disoxidation of 

 Oxide of Iron by Hidrogen Gas*, 



Disoxidation of IJeSIROUS of repeating the experiment of Messrs. 

 gen gas. Priestley, Chaussier^ and Amadeus Berth ollet, on the dis- 



oxidation of iron by hidrogen gas, I last year employed 

 Mr. Charbaut, then a pupil of the School of Mining, to 

 make the experiment in my presence. He proceeded in two 

 ways; in one the iron was disoxidated by hidrogen, in the 

 other by oil and charcoal. In the latter experiment the 

 metal was fused by increasing the temperature, so as to 

 obtain a button of iron. 

 More weight On comparing these two modes, I was astonished to And, 

 iXSfonb'y^a *^** *^® diminution of weight of the oxidule of iron by hi- 

 and charcoal, drogen was always greater than that effected by oil and 

 charcoal. The perplexity into which I was thrown by these 

 The experi- results induced me to repeat the experiment anew. Ac- 

 t pea e . j,Q,.^jjjg]y ^^j^jg yg^^ J employed at the Practical School of 

 Mining the pupil Desroches, of whose sagacity and pre- 

 cision I was previously satisfied, to decompose by the action 

 of hidrogen gas oxidules of iron from the valley of Aoste, 

 and specimens of oligist iroa from Elba, while other pupils 

 assayed the same minerals before me in the dry way. Tho 

 results obtained agreed precisely with those of last year; 



* Ann. dc ChJm. vol, Ixxiii, p, HI, 



Finally 



