. Smithsonian miscellaneous collections. Fig. 19.—7-day period in solar radiation and Fic. 20.— period in solar radiation and pressure. NO. 7 THE ATMOSPHERE AND THE SUN CLAYTON 31 Figure 21 shows the observed values of solar radiation duringDecember, 1923, and January and February, 1924, These values arecompared with the observed values of pressure at Spitzbergen andat Haml)urg. A 24-day period of oscillation is evident in each caseand this oscillation is shown by the dotted curves computed fromthe data in each case by harmonic analysis. Pressure data from all

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