100 



o. A. Åkesson 



Figures. 



Page 



Fig. 1. Daily Mean Area of Sun-spots 1874—1910 2 



» 2. Tlie Distribution of the Motions in Longitude 32 



» 3. The angular Velocity of the Sun at different Latitudes 38 



» 4. The angular Velocity V at different Latitudes as a Function of u) 44 



» 5. Proper Motion in Latitude of Recurrent Spot Groups 51 



» 6. Proper Motion in Latitude of Recurrent Spot Groups compared with a normal Distri- 

 bution 52 



» 7. The Dispersion in Longitude and Latitude as Function of the Spot-area 68 



» 8. The Difference between the Number of first and last Observations at different Distances 



from the Central Meridian 87 



Plate. 



Pl)otogrHph of tlie Sun taken at the Royal Observatory, Greenwich, at 12"l2'"22'' Greenwich 

 Mean Time, Felnuary 5, 1905. 



Printing finished March 31, 1914. 



