8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



are drawn exactly on the dates when minima of temperatures should 

 arrive, counting intervals of 6.6485 days from January 17.0000, 1946. 

 The December minima in these figures 2 and 3 all fall within i day 

 or less of the expected dates. As shown in Smithsonian Miscel- 

 laneous Collections, vol. iii. No. 13, so in figures 2 and 3, the two 

 cities behave almost identically. The average range of the periodic 

 fluctuation is i8°6 F. at Washington, and i8?o F. at New York. This 

 is about at the maximum for the year. In July, as stated in Smith- 

 sonian Miscellaneous Collections, vol. iii, No. 13, the range is much 

 less. But surely one may conclude that, though not as yet thoroughly 

 available for long-range temperature prediction, the period of 6.6485 

 days is a major factor in weather. 



