04 
THE VOYAGE OF H.M.S. CHALLENGER. 
50 < .< . <>f silver, and in one case the second mother-liquor was again precipitated with 
oO<\< of the reagent. The results are given in the following table. Column I. gives 
,i r. ; . r. 11 . mark ; Column 11. the symbol assigned to the water; Column III. the bromine 
f,.iind in tli.- first precipitate ; Column IV. that in the second ; Column V. that in the third ; 
Column VI. the total bromine in milligrams per kilogram of water analysed: — 
No. 
Water. 
Bromine, milligrams, in 
I. Prec. 
II. Prec. 
III. Prec. 
Total. 
7 
A 
49-34 
11-21 
60-55 
Filtration. 
g 
A 
54-41 
Do. 
9 
B 
53-95 
9-62 
63-57 
Do. 
10 
B 
55-41 
Do. 
19 
A 1 
55-58 
7-66 
63-24 
Decantation. 
20 
A 1 
55-81 
Do. 
21 
B 1 
56-91 
7-71 
1-58 
66-19 
Do. 
22 
B» 
56-63 
Do. 
A 'liming No. 21 to have given the whole of the bromine, it would follow that 
100' dded to l litre of sea-water bring down 85*8 per cent, of the total 
bromine; hence the results of the first (rejected) series of bromine determinations in 
Challenger waters are liable to correction by multiplication with = 1*165. Applying 
oO’o 
thi o the mean weight of bromine found in those fourteen determinations per 100 
■ , inlorim w< have 0*292 x DIGS =0*339, which, as will be seen, comes pretty near the 
final result. 
(2.) Synthetical Trials. 
Ii ! ! tli. trial 30 grm . of pure chloride of sodium were dissolved in water, mixed 
Knov. n weight of the standard bromide of potassium solution, made up to 
■ >n< lit r > . and t In- mixture subjected to successive precipitation with known volumes of 
i In' ion. f-laoh precipitate was chlorinated, or, if presumably very poor 
'•d t'T bromine qualitatively. No filters were used in these or in any of 
the subsequent analyses. 
