ON THE OSMOTIC PEESSURES OF CALCIUM FERROCYANIDE SOLUTIONS. 329 



The emergent column correction was - 0-038 

 thermometer zero -0-175 



Total -0-213 



For the 1st set of observations the true mean temperature was 0-076 C. ; mean resistance, 33330 ohms. 



2nd 0"-114,, 33298 



For a change of temperature of 038 C. the change of resistance was 32 ohms. 



Therefore taking the mean of all the observations, and correcting for temperature, the resistance of the 

 solution at C. was 33393 ohms. 



solution of N/25 was first made up accurately by weight ; 10 gr. of this was added to 

 400 gr. of conductivity water in flask A. At the same time as the water was added 

 to flask A, a similar quantity of the same water was poured into flask B. Both flasks 

 were kept stoppered, and whenever one flask was opened for any purpose the other 

 was opened for the same length of time and in the same place. In this way it was 



VOL. CCIX. A. 2 U 



