148 
6 Magnesia 2*03233 
7 Mixed Alkaline Chlorides .. . 27*18363 
8 Potassium *39131 
9 Sodium 10*40200 
10 Ferric Oxide -00465 
11 Ammonia *00011 
12 Nitric Acid -00156 
13 Fixed Constituents 33*83855 
These substances arranged on the assumption that the 
strongest acid is united with the strongest base, yield the 
following numbers : — 
Sodium Chloride 26*43918 
Potassium Chloride *74619 
Magnesium Chloride 3*15083 
Magnesium Bromide -07052 
Magnesium Sulphate 2-06608 
Magnesium Carbonate traces. 
Calcium Sulphate T33158 
Calcium Carbonate *04754 
Lithium Chloride traces. 
Ammonium Chloride *00044 
Magnesium Nitrate *00207 
Silicic Acid traces 
Ferrous Carbonate *00503 
33-85946 
Amount directly determined 33*83855 
The water employed in the foregoing analysis was 
collected in midwinter. It becomes interesting to know if 
its composition is uniform during the various seasons of the 
year. Fortunately we can offer some evidence on this point. 
In August, 1865, after a continuance of exceptionally fine 
weather, one of us collected some sea water in the neighbour- 
hood of the “ Bahama Bank” Light Ship, and determined 
the total quantity of its saline constituents, together with 
the amount of chlorine and sulphuric acid. The proportion 
