OF ARTS AND SCIENCES. 



11 



of two hours' boiling, two other portions were filtered off and treated 

 in a similar way. These determinations were then repeated with a 

 fresh quantity of chloride of silver, and afterwards taking a third 

 quantity of chloride of silver, the boiling water was simply poured 

 on twice in succession, and the similar portions thus obtained treated 

 as before. The results in every case were nearly the same as shown 

 in the following table. In this table 



1 and 2 are results after one hour's boiling of 1st quaptity. 

 3 and 4 " " " two hours' " " " " 

 5 and G " " " one hour's " " 2d quantity, etc. 

 7 and 8 " " « two hours' " " " " " 

 9 and 10 after simply pouring on boiling water. 

 10 and 12 " " " " " « 



If we assume that the amount of chloride of silver precipitated by 

 nitrate of silver under the conditions described above is a con-ect 

 measure of the solubility of the chloride, it appears from the above 

 determinations that about two milligrammes of chloride of silver are dis- 

 solved by each litre of boiling water, and further that only about one 

 half of the amount thus dissolved is precipitated by hydrochloric acid. 



In making chlorine determinations, it is a very common practice to 

 wash with very hot water, in order to secure the jirompt settling of 

 the chloride of silver, or to wash away any occluded material, and it 

 was the chief object of this investigation to determine the extent to 

 which the solubility of the chloride in distilled water might affect 

 the result. For this purpose we made two series of determinations 



