1JS 
TIIE VOYAGE OF H.M.S CHALLENGER. 
In deference to an established custom, and the presumable wishes of some of my 
ivaders, I have translated these numbers into the following hypothesis on the 
Proximate composition of 100 parts of Sea-water salts. 
Chloride of sodium, . 
Chloride of magnesium. 
Sulphate of magnesium, 
Sulphate of lime, 
Sulphate of potash, . 
Rromide of magnesium, 
Carbonate of magnesium, 
77-758 
10-878 
4-323 
4-070 
2-465 
0-217 
0-290 
100-001 
But the best mode of representing the results, is to express them with reference to 
100 parts of chlorine. 
To refer them to 100 parts of pure chlorine would be of no use, because it is the total 
halogen determined ms chlorine which forms the convenient standard. 
With reference to it we have 
Chlorine. 
99-848 
Magnesia. 
11-212 
Per Halogen = 100 of Chlorine* 
Bromine. Sulphur tri oxide. Carbon dioxide. Lime. 
•3402 11-576 -2742 3-026. 
Potash. Soda. Total Salts. f 
2-405 74-462 180-584. 
I am indebted to Mr. John M'Arthur for the scrupulous care with which he performed 
the whole of t lie analytical work referred to in this chapter. 
dly,anduwil ilic atomic \vui;,'liC ( '1 = 35-5 and Ag=108. Hence 
» 4t h« dl “ !<>o j~ir‘ «f chlorine would 1-e j .;irt > of “ chlorine " with us. The dillerence is insignificant. 
o have called <• i- tin- mini total of “chlorine,” SO3, CaO, MgO, K 2 0, 
minna (O j*t Cl,). To obtain the true ( , we should have to add the traces of silica, alumina, &c., which 
I did not determine in my analyses. Compare page 2. 
