2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



from 1926 to 1929 inclusive. The columns of maximum precipitation 

 in 1924 and 1925 are shifted from this prevailing place only two col- 

 umns and one column later than this in the week, respectively. In 1930 

 the highest maximum occurs several days later in the week, but a maxi- 

 mum only a very little lower than this occurs in the same column 

 as for 1925. In 193 1 the position of maximum returns to the column 

 frequented from 1926 to 1929. 



Table i— Percentages of Monthly Total Precipitation Falling on Successive Days 



of the Week, 1929 



Month Day of the week at percentage precipitation 



T [Wed. Thur. Fri. Sat. Sun. Mori. Tues. 



) 2 18 30 T,2 6 O 12 



t, , (Tues. Wed. Thur. Fri. Sat. Sun. Mon. 



Feb < 



10 35 51 o 3 o 1 



, , J Mon. Tues. Wed. Thur. Fri. Sat. Sun. 



Mar < 



16 43 7 o o 34 o 



. jSun. Mon. Tues. Wed. Thur. Fri. Sat. 



Apr < 



1 34 10 38 1 14 3 o 



, T J Sat. Sun. Mon. Tues. Wed. Thur. Fri. 



May < 



{ o 29 29 8 19 13 2 



T j Fri. Sat. Sun. Mon. Tues. Wed. Thur. 



June < 



I 26 27 2 20 15 9 1 



T , fThur. Fri. Sat. Sun. Mon. Tues. Wed. 



Julv < 



I o 30 o o 63 o 7 



. Wed. Thur. Fri. Sat. Sun. Mon, Tues. 



Aug ( * 



o 15 15 65 o o 4 



„ I Tues. Wed. Thur. Fri. Sat. Sun. Mon. 



Sept \ 



{ 38 o 25 o 14 19 5 



<-. . fMon. Tues. Wed. Thur. Fri. Sat. Sun. 



Oct 



o 59 40 o 1 o o 



XT (Sun. Mon. Tues. Wed. Thur. Fri. Sat. 



Nov < 



\ 40 36 o 7 5 5 7 



r^ ! Sat. Sun. Mon. Tues. Wed. Thur. Fri. 



Dec n 



•! 4 4 55 o 27 6 4 



Sum, year 170 306 292 133 167 89 43 



Percent, year 14 26 24 11 14 7 4 



If, as suggested above, the cause of the weekly weather period 

 is associated with solar rotation, and if the period is constant while 

 the phase is subject to changes as features form and disappear on the 

 sun, then there is no reason to expect the interval which we term the 

 year to have any special relationship with the persistence of any par- 

 ticular phase. Accordingly we have sought to make a better arrange- 

 ment by comparing from month to month the distribution of per- 

 centages of precipitation falling on the dates I to VII of table 2. 



