SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



Table i.- — Solar Constant Values (Continued) 



(2) In the second place we find positive correlations on the first 

 day in all years except 1916. The lack of it in 1916 is explainable, 

 as we shall see. Hence the supposedly solar variations are surely not 

 due to mere accidental errors of observation, for this result shows 

 that during several days in a group the solar constant values are apt 

 to be affected in the same direction. This is not a certain proof that 

 the variations are solar. The same thing would very likely be found 

 if they were due to atmospheric causes. 



However, the variability of the sun is now indicated 1 by (a) 

 Mount Wilson observations of the solar constant, (b) comparison of 



1 See Annals of the Smithsonian Astrophysical Observatory, 3 ; Smith- 

 sonian Miscellaneous Collections, 65, Nos. 4 and 9 ; and 66, No. 5 ; Terrestrial 

 Magnetism and Atmospheric Electricity, 20, 143, 1915. 



