﻿136 



Mr. Clinton J. Davissoh on the Positive 



were from a supply of Baker's analysed calcium chloride. 

 Various methods of "coating the chloride on to the strip were 

 tried, but without apparent effect upon the irregularity of 

 the emission. In the successful experiments mentioned the 

 values of e/m were found to be 3tf0 and 276. Although 

 these approximate to the electrolytic value for calcium and 

 one-half that value respectively, it seems more probable that 

 they are due to emissions of sodium and potassium ; the 

 approximations are better, and the temperatures at which the 

 curves were obtained were much below 1000° C. The data 

 occur on the first two lines in the following table : — 



Calcium Chloride. 



V. 



H. 



d. 



2*. 



e/m. 



487 



(e/m) K+ 



( e »Na+ 



148 

 1 148 



147 



4600 

 4600 

 4600 



0-48 

 0-48 

 0-49 



•161 

 •136 

 •140 



380 

 276 

 264 



249 



422 



The data on the bottom line are for a mixture of calcium 

 chloride and calcium sulphate. The temperature in this case 

 was high and the emission may have been calcium. 



Calcium Pliosphate. 



This salt was prepared from Baker & Co's. analysed calcium 

 chloride and Kahlbaum's ammonium phosphate. The observed 

 values of e/m approximate to one-half the electrolytic value 

 for calcium, but judging from the cases of barium phosphate 

 and strontium phosphate prepared from the same supply of 

 ammonium phosphate, it seems probable that the emission 

 was really due to potassium. The results follow : — 



Calcium Phosphate. 



V. 



H. 



d. 



2ar. 



e t in. 



(e/"0 Ca4 . + ! (*M) K+ 



206 



2915 



1-32 



"555 



271 



487 



249 



402 



2915 



1-32 



•331 



249 







401 



2915 



1-32 



•359 



220 







400 



2915 



1-32 



•375 



240 







Magnesium. 

 The salts of magnesium tested have been the chloride, the 

 fluoride, and the phosphate. It seems probable from the 

 variation of the values of e/m with the temperature that a 



