48 



SiMlTHSONIAN MISCELLANEOUS COLLECTIONS VOL. Jl 



of temperature change to solar change at the time of greatest solar 

 activity was found from the averages of several years to be 1.4° C. 

 for each change of i per cent in solar radiation, the mean solar values 

 being derived mostly from the observations at Mt. Wilson, Cali- 

 fornia. Since the extreme solar values range about 6 per cent on 

 either side of the mean, there might result departures from the 

 normal at Buenos Aires from this cause of about 8.5° C. The 

 extreme departure from the normal observed at Buenos Aires during 

 the past 13 years has been about ii.5°C. It should be remembered, 

 however, ( i ) that the solar measurements are much interrupted and 

 cover only a part of the period, while the temperature observations 

 are continuous ; (2) that any error in the solar measurements would 

 tend to lower the correlation ratio which might be 1.9° C. instead of 

 1.4° C, if there were no such errors. 



8. Using the " regression coefficients " derived from the data col- 

 lected for 1913, computations were made of the changes of tempera- 

 ture for I per cent change in solar radiation. The results are given 

 in table XVII and show that in the tropical regions the ratio of tem- 



Table XVII. — Change of Temperature for One Per Cent Change of Solar 



Radiation Computed from the 5-Day Means of Daily 



Maxima of Temperature in 1913 



Place 



Hong Kong, China. 

 Manila, Philippines. 



San Isadora 



Mauritius, I. Ocean. 

 Entebbe, Africa . . .. 

 Zomba, " . . . . 



Zunger'u, '' . . . . 

 Bathurst, " . . . . 

 Kingston, Jamaica. . 



Arica, Chile 



Merida, Mexico. . . . 



St. Johns, N. B 



San Diego, Cal 



Sacramento 



Buenos Aires 



Latitude 



22" I 



14 35 



15 22 

 20 6 



5 



15 23 



9 49 



13 24 



17 56 



18 29 

 20 50 

 45 17 

 32 43 

 38 25 

 34 2,^ 



8' N 



S 

 N 

 S 



N 



Longitude 



114° 10' E 



120 59 " 



120 53 " 

 58 ii " 

 32 28 " 

 35 18 " 



6 10 " 



16 16 W 



76 41 " 



70 20 " 



89 40 " 



66 4 " 



117 10 " 



121 31 " 

 58 22 " 



Temp. 



o°.53C 



.64 



.77 



.24 



o .17 



o .47 



.^2 



o .41 



.21 



.62 



.31 



1 .00 



1 .42 



2 .30 

 I .40 



perature change for i per cent change of solar radiation is slightly 

 less than the 0.7° C, the value estimated from theoretical considera- 

 tions by Dr. Abbot (Scientific Monthly, Vol. 5, No. 4, Nov., 1917)- 

 The correlation ratio for Buenos Aires is that determined from 

 the unsmoothed mean of several years at sun-spot maxima. The 

 temperature changes for i per cent change of solar radiation given in 



