2 3 6 



This represents a very gradual approach to the atomic 

 ratio, and in the last case the results fall on both sides of 

 this value. 



Ba (Oa N)2 : Ba O4 S = 261 : 233 = 1.12 017. 



Turner , 1833, 3 Det. ; which were 41 high, 16 high and 

 29 low, the mean of which is 9 high. 



Now, since the mean of Marignac above was 8 low, this 

 mean of Turner just about cancels it. 



The two processes are essentially alike, the final product 

 being the same, and curiously enough, the atomic ratio being 

 practically the same number. 



This gives rise to a peculiar check of which we may have 

 something more to say in a near future. 



2 H2 O : Ba Ch, 2 Hz 0=136 : 244 = 0.14 754. 



Marignac, 1838, operated on 2 different samples, A and 

 B 7 giving 



A, 3 Det., 800 790; 10. Mean 41 high. 



B, 3 Det., 810 800; 10. " 49 high. 



Since now Ba 1=137.1 gives the atomic ratio 6 low, this 

 would point to Ba belorv 137, say 136.2. The dehydration, 

 therefore, is of little value, except as to indicate that the 

 atomic weight is not above 137. 



The first two ratios are also rather dull, a change to 137.1 

 lowering the ratio about 6 only. As the analytical excesses 

 were individually on both sides, and for the two processes 

 about equal, representing 0.15 above and below 137, we 

 must conclude that this value 137 is proved by the dry way 

 processes here enumerated. 



If Ba=i37.5, all these analytical excesses would be 

 increased considerably, and the results would all be very lou\ 



The wet way Silver Process has been applied repeatedly 

 to the Chloride, and by Richards to the Bromide also. The 

 atomic ratios are: 



Ba Ch : Agz = 208 : 216 = 0.96 296. 

 Ba Br2 : Aga = 297 : 216 = 1.37 500. 



Either of these gives for 137.1 a rise of 46. 



For the chloride, Marignac, in 1848, found the mean of 

 ii determinations, 64 high. Dumas, 1860, 16 determina- 



