446 PROCEEDINGS OF THE AMERICAN ACADEMY. 



of neutral gold chloride. This has been found to oxidize carbon 

 monoxide to dioxide without affecting hydrogen. 13 Gold chloride in 

 an excess of potassium hydrate is even more sensitive to carbon mo- 

 noxide, but it was found that hydrogen reduced the gold in the alkaline 

 solution to a black powder if left in contact with the solution over 

 night. 



The charge consisted of about equal portions of powdered carbide 

 and a mixture of lime and carbon. It had been used in a previous 

 run. 



The cuprous chloride in the Liebig bulbs had been used in the three 

 previous experiments, but as a little was tested with water and gave a 

 heavy white precipitate it was not thought necessary to change the 

 solution. 



The furnace was evacuated to a pressure of 0.28 centimeter and 

 hydrogen was let in to 1.0 centimeter; then evacuated to 0.1 and 

 carbon monoxide let in to 0.3 centimeter. Hydrogen was then ad- 

 mitted to 67.3 centimeters requiring three hours with a current of 

 about 14 amperes. 



The gain in the gold chloride bulbs was relatively large, probably on 

 account of the cuprous chloride having taken so much carbon monoxide 

 into solution that it was not so good an absorber as when fresh. 



p x = 65.7 cm. of mercury 

 # = 34.5 " 

 #, = 92.0 " 



0.000703 X 0.0821 X 287 X 760 X 92 _ DO 



.*. » rn = — = 0.88 mm. 



FC0 19.9 X 65.7 



13 Phillips, Am. Chem. Journ. 1894, 16, 273. 



