VI SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. /O 



Incoming and outgoing radiation. Dust and cloud formation. 



Proof of the failure of Blanford's hypothesis shown b}' obser- 

 vations in the Indian Ocean. 



A common error of earlier authors. 



Evaporation and temperature. 



Air pressure distribution and solar activity. 



Air pressure difference Colombo-Hyderabad. 



Variations of the northeasterly trade wind and the surface tem- 

 perature. 



The air pressure differences of the North Atlantic and the tem- 

 perature variations. 



Air pressure in Stykkisholm and temperature in Stockholm. 



Variations in the air pressure gradient and in solar activity. 



Eight-month periods in the sun spots and in the air pressure 

 difference over the North Atlantic. 



Two-j'ear periods in the sun spots and in the temperature of 

 Scandinavia. 



Possible one-year period in the sun spots. 



Various periods. 



Secular variations in solar activity and in meteorological re- 

 lations. 



Close connection between the variations in solar activity and in 

 meteorological elements. 



XIII. Conclusion 266 



Postscript 267 



Investigations on fluctuations in solar radiation by Abbot, 

 Fowle, and Aldrich. 



Dr. Bauer on solar radiation and terrestrial magnetism. 



Dr. Abbot on fluctuations in solar radiation, sun spots, and ter- 

 restrial temperature. 



Dr. Clayton's investigations on correlation between solar radia- 

 tion and terrestrial temperature. 



Dr. Clayton's values of the correlation factor are not directly 

 due to the effect of solar radiation on terrestrial tempera- 

 ture, but to its effect on the distribution of pressure. 



Effect of the short-period variations of solar radiation on the 

 pressure gradient and temperature at Bergen, Norway. 



Fluctuations in air pressure and sun spots studied by twelve- 

 month means. 



Fluctuations in terrestrial temperature compared with fluctua- 

 tions in air pressure and solar radiation studied by twelve- 

 month means. 

 Appendix I 307 



Temperature departures for forty-seven inland stations, 1875- 

 igio. Communicated by C. G. Abbot, Director, Smithsonian 

 Astrophysical Observatory. 



Bibliography 334 



Tables 340 



iW. Deviations of the surface temperatures for 2° regions of 

 longitude, Channel-New York. 



