. Smithsonian miscellaneous collections. age daily changes in sunspots accompanying new anti-cyclones and cyclones are given in table 2 and plotted in figure 7. Table 2.—Mean change in sunspot numbers observed at Zurich on days offirst appearance of new anticyclones in North America Days —2 —1 Day of +1 +2 Cases I. New anticyclones (morning map) north of 60° N. Mean of year 1936 — — — 49 1941 -3-9 3-0 39 II. New cyclones (morning map) 20°-40° N. and 50°-ioo° \Y. Mean of year 1936 — 44 31 1941 — — 21 III. New anticyclones (evening
. Smithsonian miscellaneous collections. age daily changes in sunspots accompanying new anti-cyclones and cyclones are given in table 2 and plotted in figure 7. Table 2.—Mean change in sunspot numbers observed at Zurich on days offirst appearance of new anticyclones in North America Days —2 —1 Day of +1 +2 Cases I. New anticyclones (morning map) north of 60° N. Mean of year 1936 — — — 49 1941 -3-9 3-0 39 II. New cyclones (morning map) 20°-40° N. and 50°-ioo° \Y. Mean of year 1936 — 44 31 1941 — — 21 III. New anticyclones (evening map) north of 6o° N. Mean of year 1936 11 1941 — — —41 14 IV. New cyclones (evening map) 20°-40° N. and 50°-ioo° W. Mean of year 1936 17 1941 — — — 20 10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 104 Before Day of After-2-1 0 1 2 Anticyclones60-70° 8h Day of After0 12 Before-2 -1 ?1 1 rn Cyclones20-40°\ 8h. Fig. 7.—Mean daily changes in sunspots on days of origin of anticyclonesand cyclones in North America and on the 2 days preceding and = by morning map; 20h = by evening map. The frequency of origin of anticyclones and cyclones in differentlongitudes for the 2 years 1936 and 1941 is given in table 3 and isplotted in figure 8. Table 3.—Frequency of origin of anticyclones and new cyclones in different longitudes AnticyclonesBetween latitudes 6o° and 750 N. Longitude W. 91 °-ioo° ioi°-iio° ui°-i2o° I2i°-i30° I3i°-i40° i4i°-i5o° 1936 3 5 17 9 6 3 1941 8 6 9 11 3 1 New cyclonesBetween latitudes 200 and 400 N. Longitude W 6o°-7o° 7i°-8o° 8i°-9o° 9i°-ioo° 1936 7 15 I2 I2 1941 6 12 23 10 NO. 19 SUNSPOT CHANGES AND WEATHER CHANGES—CLAYTON II This plot shows that anticyclones in North America originate mostfrequently near longitude 1200 W. at about 65° N. In the averagethey reach the Atlantic Coast of the United Stat
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