398 



Prof. B. Stewart on 



[May 16, 



taking the average sun-spot inequality due to the period of Mercury 

 (see Table X), we find a spot maximum somewhat before the time 



Diagram IT. 



when Mercury comes to its perihelion, and again taking the sun-spot 

 inequality due to the period of Mercury and Jupiter (see Table X), 

 we have likewise a maximum somewhat before the time when Mercury 



