114 THE ATOMIC WEIGHTS. 



Series A. 



3.137 grm. SrCl 2 = 4.280 grm. Ag. Ratio, 73.2944 



1.982 " 2.705 " " 73-27I7 



3.041 4.142 " 73.4186 



3.099 " 4.219 " 73-4534 



Mean , 73-3595 

 Series B. 



3.356 grm. SrCl 2 = 4-574 grm. Ag. Ratio, 73-3713 



6.3645 8.667 " 73.4327 



7.131 9.712 " 73.4246 



Mean, 73.4095 

 Series C. 



Mean, 73.455 1 

 Mean of all as one series, 73.4079, .0170 



Combining these data we have : 



Pelouze 73.478i, rb .0050 



Marignac 73.4079, .0170 



General mean 73.4725, zb .0048 



The foregoing figures apply to anhydrous strontium chloride. The 

 ratio between silver and the crystallized salt, SrCl,.6H,O, 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. SrCl 2 .6H 2 O =4.0515 grm. Ag. 123.411 



4.0495 " 123.472 



4.0505 " 123.442 



Mean, 123.442 

 Series B. 



5 grm. SrCl. 2 . 6 H 2 O 4.0490 grm. Ag. 123.487 



4.0500 " 123.457 



4.049 " 123.487 



Mean, 123.477 

 Mean of all as one series, 123.460, .0082 



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



