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Equivalent proportions of alkalies and alkaline earths in the bedrock and major river waters of Finland . . . . . . . . . .798 Comparison of ionic composition in waters of arid and humid regions . . . . . .799 Supply of ions by atmospheric precipitation, and the discharge of ions by river waters, in two districts of Finland . . . . . . .803 Comparison of average ionic concentrations in 1 year's atmospheric precipitation with average or minimun1 concentrations observed in lake or river waters . . . . . .804 Range of ionic concentration in European air masses during December 1957 and June 1958 .
Eville Gorham (Sun,) studied this question.