Mr Barlow, On the Osmotic Pressure of Aqueous Solutions. 237 



commutator still was 979*88 ohms ; with the commutator working 

 it was 979 - 7o ohms. From time to time during the experiments, 

 the coil was put in to see that the commutator was working 

 satisfactorily. 



The water used in the second set of readings was rather better 

 than the other, having an absolute conductivity below 30 x 10~ G 

 to begin with. The conductivities are obtained from measure- 

 ments extending over 15 days; they are corrected to 10°*o C. 

 The outer vessel was left open to the air. 



Date 



Conductivity 



Date 



Conductivity 



March 2 



» 3 



» 4 

 » 6 



» 7 



2-93. 10- 6 



4-28 



5-25 



6-52 



7-05 



March : 8 



» 9 l 

 „ 13 



„ 15 



„ 17 



7-48. 10- 6 



! 7-81 



9-31 



9-92 



10-45 

















Curve II. 



















































-6 

 x10 

































' 



100 









































































































































7-5 















/> 





















































-IVITY 









































































/ 































5-0 































/ 



/ 





































































































































Tit 



t£ // 



/ Da 



<s 























5 10 15 



The differences in the general character of these curves are 

 important. In Curve I, where the water was not exposed to the 



