PHENOMENA OF GROUPS OF SOLAR SPOTS, 191 



and in all the siic groups now visible the largest spot is in 

 the preceding sub-group. 



September 15, ^h. i^w^. p.m. All the groups now 

 visible have an elongated form, and in five of them the 

 largest spot is in the preceding, and the next in size is in 

 the following end of the group, giving each the appear- 

 ance of a double group, the sub-groups being connected 

 by irregular lines of very small spots. In the sixth group 

 (H) the two largest spots are equal or nearly equal in size, 

 but there is a disposition to the same arrangement. 



September 16, 8^h. a.m. Preceding large spot of H 

 now decidedly larger than following; preceding 7, and 

 following 8 magnitude. 



September 17, gh. a.m. A new group has broken 

 out at e ; following principal spot jth mag. ; preceding 

 'j\m.; one or two 10th mag. between them; the following 

 principal spot is very black, and has no penumbra. The 

 chief spot in following sub-group of H is also very black. 

 ^h. p.m. Three or four small spots 72 /following the sub- 

 group of H. Preceding large spot of e is now rather 

 larger and blacker than following large spot; four spots in 

 preceding sub-group. 



September 18, iiA. a.m. Following large spot of H 

 now larger than preceding. 



September 19, gh. a.m. Many new spots in H, and 

 several in e, but second principal spot of H and both those 

 of e have diminished in size. A new group has entered 

 disc at J — principal spot 7^ mag., second principal 9 

 mag., and three or four xoth mag. spots. A new group 

 has broken out since yesterday at Q ; the following spot is 

 the largest, and is very black; two principal spots and 

 many smaller ones. 4!^. p.m. The spots in e are now 

 all nearly of the same size. Counted twenty-five spots in 

 group H. Preceding principal spot of Q is now equal to the 

 following, and two spots have broken out near the latter. ~ 



