SMITHSONIAN EXrl.ORATIONS, 102 



which he finds anioiintiny to from fifty to one hundred |)er cent, go 

 closely parallel to the changes in total solar radiation of from one to 

 three per cent observed by the Smithsonian stations. 



Third. Dr. Austin of the U. S. liureau of Standards, observing 

 the monthly average of intensity in the receipt of radio signals from 

 great distances, finds that these fluctuate in parallel with the changes 

 in solar radiation. 



Fig. 3. — The South West African water-boy and his cliarges. 



Fourth, the investigations of Mr. H. H. Clavton on relations of 

 solar change to weather continue to give indications of useful cor- 

 relation. 



If the periodicities of ii, 15, and 25^ months continue to be found 

 in future years, and to represent as now they do the major part of 

 long range solar variation, then whatever of change in terrestrial 

 afifairs may be proved to depend on these changes in the sun will 

 ]:)robably become predictable in general terms for many months 

 in advance. 



The Monte7Aima station has been in charge of Air. Hugh B. Free- 

 man, assisted bv Mr. Eugene F. Warner. At the Table Mountain 



