1913.] HINRICHS— TRUE ATOMIC WEIGHT OF BROMINE. 555 

 II. — Mean Values of Departures, e. 



Mean of groups A and B. 

 C A, B 71.61 0.45 15.0 — 0.18 



Mean of all Determinations. 

 D C, d 71.77 — 0.22 — 7.3 0.09 



Departure as function 0/ w' = 75 — w 3-77iv' — 0.05W' 



III. — Mean Atomic Weights. 



Point Experiments w e Br H 



A I, 2, 3, 10 64.0 1.25 80.042 1.0075 



B 4, 6, 8, 9 78.3 — 0.35 79.988 1. 008 1 



General Means. 



The 2 groups of four determinations each: 



C A, B 71.61 0.45 80.015 1.0078 



All ten determinations : 



D C, d 71.77 — 0.22 79-993 1.0081 



IV. — True Atomic Weight. 

 For all possible weights, i. e. entire line : 



Point Experiments w e Br H 



A — B 1,2,3,4,6,8,9,10 71.61 0.00 80.000 1.0080 



Note. — Confirmatory deterrrinations desirable especially for weights sym- 

 metrically taken in reference to A and B ; that is for mean weights of about 

 86 and 72 grammes. 



Reference: " True Atomic Weights," 1894, p. 158. 



XII. General Conclusion. 



It will have been noticed that our work really gives three distinct 

 demonstrations that the atomic weight of Bromium is 80 exactly. 



First (as shown above in VIII.), by the Umit-uietJwd, the means 

 closely approaching the value Br = 80 exactly. 



This method was first published in the Comptes Reiidus from 

 1892 to 1894 when it was more fully developed in my book: "The 

 True Atomic Weights," 1894, of which Berthelot accepted the 

 dedication. 



