90 PROCEEDINGS OF THE AMERICAN ACADEMY 



chlorine, separately. The solution obtained from the anterior column 

 was found to contain but a trace of chlorine, giving only a milkiness 

 with nitrate of silver ; showing that the chloride of zinc does not travel 

 far through a column of asbestos from the point where the flame plays 

 directly on the tube. 



Results of the Analysis. — 0.2067 gramme of chloroform gave 0.0798 

 of carbonic acid, 0.0276 of water, and 0.7372 of chloride of silver. 



Calculated. Found. 



10.5273 

 1.4514 



88.0455 



100. 100.0242 



Experiment 2. — In this experiment, the whole length of the com- 

 bustion tube from a to d was packed with a mixture of asbestos and 

 four grammes of oxide of zinc. The temperature of the anterior end 

 of the combustion tube was regulated, as in the previous experiment, 

 by means of the air-bath. 



Results of the Analysis. — 0.1339 gramme of chloroform gave 

 0.0506 of carbonic acid, 0.0156 of water, and 0.4768 of chloride of 

 silver. 



Calculated. Found. 



10.3062 



1.2733 



87.9014 



100. 99.4809 



These two analyses, agreeing as they do so closely, indicate that the 

 chloroform analyzed contained larger percentages of carbon and hy- 

 drogen, — especially of the latter, — and a correspondingly smaller 

 percentage of chlorine than the theoretical quantities ; occasioned, 

 probably, by the presence of some impurity. This view is supported by 

 calculations made on the assumption that the excess might have arisen 

 from volatilization of chloride of zinc, or from incomplete absorption 

 of the chlorine ; which would make the chloroform contain from two to 

 six per cent more than the theoretical quantity of chlorine. These re- 

 sults are regarded, therefore, as satisfactorily establishing the utility of 

 this process in the analysis of chloroform. But the analysis of this 



