No. I PERIODS RELATED TO 273 MONTHS—ABBOT 9 
stations east of the Rocky Mountains in the United States were treated 
as I have done at Saint Louis, Peoria, and Albany. Lines of equal 
probable percentage of normal precipitation could be drawn for each 
season of the year for Io years in advance. A success of 70 percent, 
as in Saint Louis, would be a boon to industry, and moderate phase 
displacements in 30 percent would be no serious failure. After all, it 
is seasonal weather that is most desired to be known. Three-month 
averages would remove most of the blemishes. 
EE IMANAIN ee, Pe YY 
is AIENEaEESUES 
JARI AVAL GTT A BaA | 
CCN 
ak —— 
Fic. 4.—Predicted precipitation, Peoria (upper) and St. Louis (lower), 1952- 
1957, from mean forms of 22 periodicities over the epoch 1854-1939. End of 
prediction 18 years after 1939 and 60 years after middle of base, 1897. Dotted 
curves, prediction; full curves, event. Horizontal lines represent normal pre- 
cipitation. Drought indicated ending 1957. 
3. SNOW-COVERED DATES AT TOKYO, JAPAN 
My friend Dr. H. Arakawa recently published * dates of the earli- 
est wintry snow coverage for Tokyo since 1632. Many years are 
missing, but about 200 years are included. Dr. Arakawa treats the 
data very interestingly, but in Iarge groupings. It occurred to me to 
plot all the dates of first coverage, reckoned after November 30, in 
days for each year given. I plotted blank years in the same regular 
order as the rest. Though the long plot showed many breaks, I 
seemed to see in it a tendency to a period of 45% years, twice 273 
months. 
6 Quart. Journ. Roy. Meteorol. Soc., vol. 82, No. 352, p. 222, April 1956. 
