Fig. s. 



(i), Observed solar radiation values August i, 1918 to September 9; (3), 

 (5), (7), (9). and (11) progressive means of 5, 7, 9, and il days. 



(.r), Differences between observed and means of 3 days; (y) betw^een 

 means of 5 and 11; and (;:) differences between 15 and 30 da}^ means. 



(-'^'), (y') and (^'), Similar differences between the mean temperature of 

 Buenos Aires (inverted). 



