TEMPERATURES AND SUN S RADIATION ABBOT 



15 



and to the little table in the Appendix. Part of the data in table 2, 

 changed to the Fahrenheit scale, forms the frontispiece. [Here fig- 

 ure 7.] =1: * * * 



I would like to draw the reader's attention in particular to number 7 

 of the conclusions which Mr. Clayton states in the summary of his 

 research. In this he points out that variations of temperature in 

 Argentina agree well in number and in magnitude to the variations 

 which would be expected in view of the supposed changes in the solar 

 radiation. It is this and many other features of his research which 



2 4 6 8 10 12 

 DATS Elapsed Atter Solar Observation. 



M 16 



20 



Fig. 7. — H. H. Clayton's indication, published in 1920, of the influence of solar 

 variation on terrestrial temperature departures at Buenos Aires. 



have led him to the conclusion that the weather as distinguished from 

 the climate is governed by variations of the sun and would be predict- 

 able both qualitatively and quantitatively if we had daily accurate 

 determinations of the solar variation. If this be true, we stand, it 

 seems to me, on the threshold of a very important research in meteorol- 

 ogy. What is needed is the establishment of sufficient stations for 

 observing solar radiation, in order that, by combining the results of 

 all of them, well-founded mean solar radiation measurements may be 

 available every day in the year, and for a sufficient succession of 

 years, so that quantitative studies of the dependence of weather con- 

 ditions on solar variations similar to those of Mr. Clayton may be 

 advantageously pursued. 



