210 THE ALGE OF THE CLYDE SEA AREA, 
unoon 
Loch Ridun, Loch Strivan, and Holly Loch 
The months of maximum rainfall over the whole Sea-area are 
sea, the amount of pure sea-water present is rarely less than 88 per 
cent., the fresh river-water, which pours in in enormous volume 
constantly removed by the tide. This process is so rapid and 
complete that the amount of river-water actually present, diluting 
the sea-water in the Clyde sea-area, is not equal to half the annual 
infall, On an average, 1} cubic miles, 97-5 per cent. of which 
is pure sea-water, and 2°5 per cent. fresh water, enters with each 
tide, and a slightly greater amount is withdrawn, the whole being 
a little freshened, containi ’ 
In the Iri yee Sorte he 
Mie rish Channel beyond the Plateau the temperature of the 
water from surface to is nearly the same at all depths at 
