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From the CO2-data of the years 1955—59 for Scandinavia the annual cycle was determined. The picture is changing from year to year showing time displacements of the maxima and minima, which can, however, be placed “in phase” by shift of the time axis. One gets a mean value of the annual cycle of the years 1955—59 with two maxima and two minima. The total annual mean value obtained for Scandinavia is for 1955 326 ppm, 1956 321 ppm, 1957 323 ppm, 1958 315 ppm, 1959 331 ppm.
Walter Bischof (Fri,) studied this question.