MR. F. E. SMITH ON THE NORMAL WESTON CADMIUM CELL. 



TABLE IX. 



Mean E.M.F. of the Single Groups the mean E.M.F. of the American, 

 German (September 9, 1907), and English Cells. 



419 



As will be seen from the above table, the cells from America and England have 

 remained constant during the period June 20 to September 30 ; the German cells 

 of Groups P, O, M, have, however, decreased 4 parts in 100,000. Drs. JAEGER and 

 LINDECK think that it is not improbable that the alteration will continue, but owing 

 to the slightness of the change this can only be tested after long periods. 



It would seem, as the result of the last measurements on September 30, that 

 the differences between the various cells compared were, at that time, only a few 

 parts in 100,000. By making use of the average value of the cells P, O, M, obtained 

 at this time, and taking into consideration the data given in Dr. WOLFF'S report 

 (and part of that given on p. 403 of this communication), Drs. JAEGER and LINDECK 

 give the following differences for the cells of the different countries, the figures being 

 rounded off to the hundred-thousandth part : 



E.M.F. of English cells 



(Mean of more than 100 cells) 



E.M.F. of German cells 

 (Mean of P, O, M cells) 



E.M.F. of German cells 



}- 

 }- 



E.M.F. of American cells 1 

 (Mean of 12 cells) 



E. M. F. of English cells =0x10 



-* volt, 



~ 8 



- E.M.F. of American cells = + 1 x 10~* 



As the French cells are also in good agreement with the American and English 

 cells, considerable advance would appear to have been made with the standard cell 

 question. 



The English cells, H 26, C 19, P 53, and P 54, were received at Washington on 

 August 22. On the same date C 19 was about 40 microvolts higher than its 

 companion cells, but on August 27 a comparison led to the results given in 



3 H 2 



