i8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I07 



/.34Se 



462 



456 



1.9454 



1 



1 '• 



-6-6-4-2 O 2 4 6 8 lO 



Fig. 8. — Mean march of variation of the solar constant attending the 6.6456- 

 day period, as computed in figure 7 from Montezuma observations of all months 

 of September from the year 1923 to 1944. 



Fig. 9. — Mean march of variation of the solar constant, as derived in figures 7 

 and 8,_for all months, March to November, of all years from 1924 to 1944, corre- 

 sponding to the data in table 5. Upper dotted curve 10/7 the amplitude of the 

 mean curve, to allow for lacunae in the observations as explained in the text. 



