94 PROCEEDINGS OF THE AMERICAN ACADEMY 



Results of the Analysis. — 0.1 G82 gramme of chloride of amy! gave 

 0.3486 of carbonic acid, 0.1633 of water, and 0.2233 of chloride of 

 silver. 



Calculated. Found. 



Ii6\3910 56.522 

 10.3383 10.761 

 33.2707 32.773 



100. 100.056 



Analysis 2. — The oxide of copper employed was of the same prep- 

 aration as that used in Analysis 1. The space occupied by the mixture 

 of asbestos and oxide of copper was only 34 inches in length, but con- 

 tained the same quantity, viz. 5 grammes of the oxide of copper, as 

 used in the previous analysis. The temperature of the air-bath ranged 

 from 250° to 253°. At the close of the combustion, it was found that 

 all but f inch at the forward end of the column of mixed asbestos and 

 oxide of copper had the appearance of containing chloride of copper. 

 By comparison with the corresponding observation in Analysis 1, it will 

 be seen that the appearance of the chloride extends over more than five 

 times the space in this analysis as in the former, showing that with 

 strongly ignited oxide of copper a temperature higher than 250°, even 

 as high as 350°, is more favorable for the absorption of the chlorine. 

 The following results of the analysis, however, are equally accurate 

 with those of the preceding analysis. 



0.1669 gramme of chloride of amyl gave 0.3457 of carbonic acid, 

 0.1612 of water, 0.2213 of chloride of silver. 



Calculated. Found. 



, ^ , — , 



Carbon C 10 60 56.3910 56.489 



Hydrogen H u 11 10.3383 10.785 



Chlorine CI 35*4 33.2707 32.732 



100. ' 100.006 



Analysis 3. — Under the impression that an oxide of copper which 

 had been less strongly ignited might be effectual to absorb the chlorine 

 at a lower temperature, I employed in this and the two following 

 analyses a preparation of brown oxide of copper, obtained by precipi- 

 tation with potash and ignition over an ordinary gas flame. In this 

 analysis the temperature of the air-bath ranged from 150° to 158°. 

 The space occupied by the asbestos mixture was four inches in length, 



