20 THE ATOMIC WEIGHTS. 



AgCl ; a value which, corrected for weighings in air, be- 

 comes 192.32. This experiment will not be included in our 

 discussion. 



In 1842 Marignac* published two determinations, with 

 these results from 100 KCl : 



192.33 

 192-34 



Mean, corrected for weighing in air, 192.26, zb .003 



In 1846 Marignacf published another set of results, as 

 follows. The weighings were reduced to vacuum. The 

 usual ratio is in the third column. 



17.034 grm. KCl gave 32.761 AgCl. 192.327 



14.427 " 27.749 " 192.341 



15.028 " 28.910 " 192.374 



15. 131 " 29.102 " 192.334 



15.216 " 29.271 " 192.370 



Mean, 192.349, =b .006 



Three estimations of the same ratio were also made by 

 Maumene,! as follows : 



10.700 grm. KCl gave 20.627 AgCl. 192.776 



10.5195 " 20.273 " 192.716 



8.587 " 16.556 " 192.803 



Mean, 192.765, ± .017 



The three series of ten experiments in all foot u[) thus: 



Marignac, 1842 192.260, it .003 



" 1846 192.349, db .006 



Maumene 192.765, ± .017 



General mean 192.294, +: .0029 



These figures show clearly that the ratio which they rep- 

 resent is not of very high importance. It might be rejected 

 altogether without impropriety, and is only retained for the 



* Ann. Chem. Pharm., 44, 21. 1842. 



f Berzelius' Lchrbuch, 5th Ed., Vol. 3, pp. 1192, 1193. 



X Ann. d. Chim. et d. Phys., (3,) 18, 41. 1846. 



