The salter waters apparently tend to make their way westwards close to the African coast, and at the bottom the highest salinities have been observed south of Crete.
Three types of areometer are in use: (I) the ordinary hydrometer of invariable weight with a direct reading scale, a set of from five to ten being necessary to cover the range of specific gravity from 1 000 to 1.031 so as to take account of sea-water of all possible salinities; (2) the " Challenger " type of areometer designed by J.
The temperature of maximum density is lower as the concentration of the sea-water is greater, as is shown in the following table: Maximum Density Point of Sea-Water of Dif f erent Salinities.
In the eastern basin the " Pola " expedition observed salinities of 38 7 to 39 o to the east of a line joining Cape Matapan with Alexandria, and 38 2 to 38 7 to the west of it.
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