46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I46 



Table 7. — Periodicities in monthly values of departures in h'Fa 



The following table 8 shows the results from 1934 to 1954. I 

 give the ratios of yearly rainfall which came on 175 preferred days 

 to that which came all other days. The expected ratio is 1.42. 



In the year 1952 a peak rainfall 6 times the average of all other days 

 of the cycle appeared on the eleventh day. In 1953 the peak had 

 fallen to 3 times but was still extraordinary. I have wondered if 

 the surprise was caused by atomic bombing. After 1954 I was too 

 immersed in long-range forecasts, solar boilers, and my second mar- 

 riage to continue with Washington daily rainfall. 



Various periods. — 



1. The 6.6485-day period. 



Table 8. — Precipitation of Washington. 

 Ratio 175 preferred to 190 (191) other days 



Years . . 1934-1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954] Mean 



I Ratio 

 Ratio... 1.55 1.48 1.06 1.45 1.10 1.28 1.56 1.49 1.34 — — 1.31 J 1-45 



