33 ELISHJL MITCHELL SCIENTIFIC JOURNAL 



Observations of the sun during July and for the past thirty 

 days supply the material for this paper. 



At noon of July 1st there was a single small spot on the 

 sun's disk. On the 9th there were 53— forming three groups. 

 Their relative positions, and that of others observed during 

 the month, are shown in the sixteen drawings which illus- 

 trated "Sunspots in July," published in Popular Astronomy 

 for August. 



By the courtesy of the publishers the drawings are here re- 

 produced; also a part of the matter of this paper. Fig. 1 rep- 

 resents the sun's disk at noon July 9th. Group 1, on the left, 

 is simply indicated by three spots — the largest of its 21 spots. 

 Group 2, of 17 spots, and group 3, on the right, of 15 spots, 

 are indicated each by its two chief spots. 



By the next noon a half dozen spots had disappeared, or had 

 emerged with others. At noon July 11th several spots in 

 group 3 were much enlarged, as shown in the drawing for 

 that day. But of the 53 spots in view two days before, only 



34 remained. 



By July 14th group 1 had passed out of view beyond the 

 sun's western edge; and of groups 2 and 3 there remained only 

 4 spots. By the next noon, July 15, all had passed beyond 

 view except a single spot north of the equator. But a new 

 group of 8 spots had appeared on the disk's south-east quarter 

 (Fig. 5.) 



This group, it is interesting to note, had evidently formed 

 since noon of the previous day — for then that part of the sun's 

 disk was without blemish. 



So too, before the next noon another new group formed in 

 the north-east quarter — group 5, shown in drawing for the 

 16th. And again, on the 24th, there appeared a newly formed 

 group of 11 spots. It was stiil conspicuous on the 29th, the 

 last day of my July observations. 



Within that month as many as 9U spots marred the solar 

 surface — part of them north of the sun's equator and part 

 south, in two fairly well defined belts or zones as shown in 

 the drawing's. 



