i 5° M/\ Pigott’s Investigation of the Changes 
increased ” by the considerable increase of N since four days, 
with the addition of F, a slight full brightness. 
Fig. 6. “ Aug. 3 d, 7 days of rotation, 5.6 Mag. decreased by 
the going off of N, the E, which is now reappearing, being 
reduced to much less than F. 
Fig. 7. “ Aug. 19th, 1 6 days or £ rotation, 3.6 Mag. again 
decreased,” by the removal of F, by E being much less, and by 
the h also being considerably diminished. 
Fig. 8. “ Sept. 3 d, 15 days or ~ rotation, 6 Mag. still more 
decreased,” by the h being much less than E, which is now 
going off, and N scarcely reappearing, another minimum. 
Fig. 9. “ Sept. 17 th, 14 days or near ~ rotation. 5 Mag. full 
brightness considerably increased,” by N having retained its in- 
creased brightness of July 27, and now facing us centrally. 
1st, Thus are exhibited, the two short intervals of its full 
brightness, one between June 18 and July 27, of 39 days, and 
the other between July 27 and Sept. 17, of 32 days. See 
Table IX. 
2dly, The interval of 46 days between the two minima of 
July 19 and Sept. 3 ; See Table X. 
3dly, The long decrease of 38 days between July 27 and 
Sept. 3, and 
4tlily, The rapid increases of 3 and 14 days between the 19 
and 27th of July, and the 3d and 17th of September, 
As also the other intermediate changes, yet I must again 
repeat, particularly as a few days error may occasionally pro- 
ceed from the observations, that by these sketches it is not 
meant to give exact drawings of the size, distances or altera- 
tions of the spots, but merely to shew how the changes may 
take place, as, I believe, nothing of the kind has hitherto been 
