SILVER, POTASSIUM, ETC. 27 



get as follows. For experiment number three in the above 

 column there is no equivalent here : 



117-529 

 "7-531 

 "7-539 

 "7-538 

 "7-530 



Mean, 117.5334, =b .0014 



Now, combining these several sets of results, we have the 

 following general mean : 



Marignac 117.5335,^.0036 



Stas, 1st series 117.5325, d= .0024 



" 2d " 117.5373, d= .0015 



" 3d " 117.5334,^.0014 



General mean 117.5345, zb .0009 



One other comparatively unimportant iodine ratio re- 

 mains for us to notice. Silver iodide, heated in a stream of 

 chlorine, becomes converted into chloride ; and the ratio 

 between these two salts has been thus determined by Ber- 

 zelius and by Dumas. 



From Berzelius* we have the following data : In the 

 third column I give the ratio between Agl and 100 parts of 

 AgCl. 



5.000 grm. Agl gave 3.062 AgCl. 163.292 



12.212 " 7-4755 " 163.360 



Mean, 163.326, i .023 



Dumas't results were as follows : 



3.520 gi-m. Agl gave 2.149 AgCl. 163.793 



7. on " 4.281 " 163.770 



Mean, 163.782, ± .008 



General mean from the combination of both series, 

 163.733, ± .0076. 



We now come to the ratios connecting sulphur with silver 



*'Ann. d. Chim. et d. Phys., (2,) 40, 430. 1829. 

 f Ann. Chem. Pharm., 113, 28. i860. 



