10 



s. Hirayama. 



Table VII. 



Sporer's Wumbers of Sun-spots, arranged in Zones of Latitudes 5° wide, 

 giving Different Diurnal Motions. (1861-1878) 



is not symmetrical about the ordinate corresponding to jNIaxi- 

 nium I. In fact, the sun-spots selected by Sporer are best 

 suited for finding Maximum I, but not so favourable for finding 

 Maximum II. However, so far as Plate III shows, I can deduce 

 the following results. Better results M'ould perliaps be reached by 

 discussing the angular velocities of all the spots observed by 

 him. 



