214 



Mr. J. C. Graham. On the Measurement [June 25, 



The supply of salt solution is now stopped and the cock Xiis closed. 



When diffusion has gone on for 6 or 8 days the various strata 

 marked 1 to 45 in the drawing are drawn off as follows : 



The volume of the vessel between the stratum 1 and the point DI is 

 approximately known. This volume of some solution denser than 

 the salt solution is then run in through the funnel Ci, and thus the 

 top of stratum 1 is brought to DI ; the displaced volume flows down the 

 pipe D, the cock X 4 having been opened. 



Each stratum is 2 mm. thick, and has a volume of 32*6 c.c. If 

 now 32 '6 c.c. of the dense solution are slowly dropped into the funnel 



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