4 Mr. W. C. Dampier Whetham on the 



gram of water at the temperature of the laboratory, and 

 then from larger pipettes. When the volume of liquid in 

 the cell became inconveniently large, the additions of water 

 were made in a separate vessel, into which the contents of the 

 cell were emptied after each electrical measurement. 



The electrical constants of the cells were determined by 

 filling them with solutions of barium chloride of known con- 

 centrations, and measuring the resistances. The constants 

 were then calculated from Kohlrausch's determinations of the 

 conductivities of these solutions. Thus in cell No. 1 a 

 solution of 0*01 normal strength gave a resistance of 2142 

 ohms at 18°, and a solution of 0*1 normal strength a resistance 

 of 251/5 ohms at 18°*2. The constants calculated from these 

 numbers came out 2*307 x 10~ 9 and 2*305 X 10 -9 respectively, 

 the mean value being 2*306 x 10 -9 . For cell No 2, determina- 

 tions with 0*01 normal and 0*001 normal solutions gave 131 

 and 1132 ohms, which lead to values for the constant of 

 1*412 x 10" 10 and 1*408 x 10" 10 , giving a mean of 1*410 x 10" 10 . 



The following results were obtained : — 



Acetic Acid and Water. 



Per cent, of water 

 by weight. 



Resistance at 

 18° in cell No. 2. 



Conductivity in 

 C.G.S. units. 



Conductivity, 



corrected for that 



of pure solvent. 



00 



100000 



1-41x10-15 







2-15 



45000 



314 „ 



1-73x10-15 



4-22 



24000 



5-88 ,, 



4-47 ,. 



6-20 



16000 



8-81 „ 



740 





8-10 



10100 



13-96 „ 



12-55 





9-92 



7000 



2015 „ 



18-74 





11-67 



5990 



23-55 „ 



2214 





14-98 



2780 



50-73 „ 



49-32 





1805 



1760 



80-13 „ 



78-72 





24-83 



817 



173-6 



172-2 





30-58 



497 



283-6 



282-2 





39-79 



270 



522-2 



520-8 





4684 



194 



727 



726 





52-41 



152 



928 



927 





56-93 



131 



1076 



1075 





6647 



100-2 



1408 



1407 





75-51 



85-6 



1648 



1647 





8414 



82-6 



1707 



1706 





88-22 



87-7 



1608 



1607 





92-25 



94-9 



1486 



1485 





9612 



124 



1137 



1136 



' 



98-06 



168 



839 



838 





9940 







460 





99-82 







252 





The numbers below the dotted line are taken from Kohlrausch's results 

 for solutions of acetic acid in water. 



