114 THE ATOMIC WEIGHTS. 



Series A. 



3.137 grm. SrCl^ = 4.280 grm. Ag. Ratio, 73.2944 



1.982 " 2.705 " " 73.2717 



3.041 " 4.142 " " 73.4186 



3.099 " 4.219 " " 73.4534 



Mean, 73-3595 

 Series B. 



3.356 grm. SrCl2 = 4.574 grm. Ag. Ratio, 73-3713 



6.3645 " 8.667 " " 73-4327 



7.131 " 9.712 " " 73.4246 



Mean, 73.4095 

 Series C. 



7.213 grm. .SrCl2 = 9.8ii grm. Ag. Ratio, 73.5195 



2.206 " 3.006 " " 73.3866 



4-268 " 5.816 " " 73.5529 



4.018 " 5.477 " " 73.3613 



Mean, 73.4551 

 Mean of all as one series, 73.4079, dr .0170 



Combining these data we have : 



Pelouze 73.4781, zb .0050 



Marignac 73.4079, ± .0170 



General mean 73-4725, ± .0048 



The foregoing figures apply to anhydrous strontium chloride. The 

 ratio between silver and the crystallized salt, SrC1.^.6H,0, has also been 

 determined in two series of experiments by Marignac* Five grammes 

 of salt were used in each estimation, and, in the second series, the per- 

 centage of water was first determined. The quantities of the salt corre- 

 sponding to 100 parts of silver are given in the last column : 



Series A. 



5 grm. SrClj.6H20 = 4.0515 grm. Ag. 123.41 1 



4.0495 " 123.472 



4.0505 " 123.442 



Mean, 123.442 

 Series B. 



5 grm. SrCl2.6H20 = 4.0490 grm. Ag. 123.487 



4.0500 " 123.457 



" " 4.0490 " 123.487 



Mean, 123.477 

 Mean of all as one series, 123.460, zb .0082 



* Jouru. fur Prakt. Chem., 74, 216. 1858. 



