286 New Method of determining Vapour Pressures of Solutions. 



secured by an automatic device. The latter method was much the 

 more satisfactory and regular, and is relied upon for the numbers 

 published. 



Neither method, however, gives results differing systematically 

 from the other. Observations were made at reduced pressures as 

 well, and with very satisfactory results, but their publication is 

 deferred. 



The substances examined were the chloride and bromide of potas- 

 sium and sodium, and chlorides of lithium, calcium, and strontium. 

 They were for the most part obtained from Messrs. Harringtons, and 

 their purity confirmed by analyses. As the full details both of the 

 apparatus, observations, and calculations will be published later, the 

 bare results are here stated. 



Boiling point, Concentration, in 

 in degrees above gram molecules 





100°. 



per litre. 



Batio. 



NaCl.... 



0-047 



0-0460 



1-02 





0-070 



0-0685 



103 





0-074 



0-0700 



1-06 





075 



0-0720 



1-04 





0-118 



0-1130 



1-02 





0-119 



0-1140 



1-04 





0-129 



0-1240 



1-04 



KC1 



0-054 



0-0525 



1-02 





0-076 



0-0760 



1-00 





0-084 



0-0820 



1-02 





0115 



0-1183 



0-98 





0-183 



0-1888 



0-97 





0-193 



0-1970 



0-98 



LiCl . . . 



0-057 



0-0575 



0-99 





0116 



0-1140 



1-02 





0153 



0-1472 



1-04 



KaBr. . . 



0-046 



0-0460 



1-00 





0-051 



0-0525 



0-97 





0-095 



0-1050 



091 





0-107 



0-1185 



0-90 





0-160 



0-1750 



0-90 





0-160 



0-1770 



0-90 



KBr 



0056 



0-0529 



1-06 





0-074 



0-0738 



1-00 





0-076 



0-0746 



1-02 





0-088 



0-0921 



0-95 





0-094 



0-0984 



095 





0-101 



0-1070 



0-94 





0-139 



0-1500 



0-93 



