86 THE ATOMIC WEIGHTS. 



the C0 2 was collected and weighed in an absorption apparatus, which 

 was tared by a similar apparatus after the method of Regnault. The 

 following percentages of CO 2 in Li 2 C0 3 were found : 



59.601 

 59.645 



59.529 rejected. 



59.655 

 59.683 

 59.604 



59.517 



59.663 



60.143 rejected. 



59-794 



59-584 



Mean of all, 59.674 



Rejecting the two experiments which Dittmar regards as untrust- 

 worthy, the mean of the remaining nine becomes 59.638, .0173. This 

 combines with the work of Diehl and Troost, as follows : 



Diehl 59.417, =b .0060 



Troost 59.456, .0200 



Dittmar 59.638, db .0173 



General mean 59.442, =b .0054 



Dittmar's determinations give a much lower value for the atomic 

 weight of lithium than any of the others, and therefore seem to be ques- 

 tionable. As, however, they carry little weight in the general combina- 

 tion, it is not necessary to speculate upon their possible sources of error. 



The ratios for lithium are now as follows': 



(l.) AgCl : LiCl : : 100 : 29.584, .0075 



(2.) Ag : LiCl : : 100 : 39.358, .001. 



(3.) LiCl : LiNO 3 : : 100 : 162.5953, .0025 



(4.) Per cent, of CO 2 in Li 2 CO 3 , 59.442, .0054 



And the data to use in their reduction are 



O -- 15.879, .0003 N 13.935, =t .0015 



Ag 107.108, .0031 C = 11.920, db .0004 



Cl == 35-179, .0048 AgCl= 142.287, .0037 



These factors give two values for the molecular weight of lithium 

 chloride, thus : 



From (i) LiCl = 42.0942, .01 10 



From (2) =42.1556, .0016 



General mean LiCl = 42. 1542, .0016 



