abstracts: chemistry 



465 



TABLE 1 



In the 10 experiments 9.00369 grams of hydrogen were combined 

 with 714.05722 grams of bromine and yielded 723.05828 grams of hydro- 

 bromic acid. The value obtained from these two sums is respectively 

 79.307 (1) and 80.306 (9). 



The final ratio obtained from these figures for H : Br is 79.306 (7), 

 with a probable error of 0.0022. The ratio found from H : HBr is 

 80.306 (4), with a probable error of 0.0018. Combining the two the 

 value is 79.306 (6) ± 0.0014. The numerical value of the probable 

 error is somewhat larger than that of the chlorine ratio obtained in a 

 similar manner. Relatively it is approximately the same or even some- 

 what smaller. 



Taking the atomic weight of hydrogen 2 as 1.00779, the value for 

 bromine on the oxygen basis becomes 79.924, as against the value 

 79.920 given by the International Commission for 1912. 



H. C. P. W. 



2 Clarke: Recalculation of Atomic Weights, p. 41, 1910. 



