^78. VARIABLE STARS. 



Explanation by are fphcrical views, on an enlarged fcale, for each quarterly/ 

 ^h^ ^^""^^ °l r^^^^^'^o" OC lefs, (hewing the principal changes, as exprefled 

 variations and »" the adjoining remarks, and correiponding with the oblerva- 

 irregularities of tions ; thefe being taken from my printed paper, as already 

 light in the ftar . , , , • ,. r, -u i r ^r ^ *u r * 



in Sobiefki's mentioned, are marked ni italics. It will be ieen that the Ipots 



/hield. by which the changes are principally regulated, are placed at 



equal diftances, yet intermediate ones might alio frequently be 

 inferted without occaiioning any objection, but that of render- 

 iJig the explanations more complex. 



REMARKS ON PLATE III. 



Fig. 2. " June I 8///. Full brighbiefs Mag. bright 5th/' before 

 ' or after which date the ftar would appear lefs bright, by the 



fpot E being removed from the centre, and one of the others 

 out of view. 



^'g- 3. '*/«{^ ^^t 15 days or | rotation being elapfed fincc 

 June ]Sth, 5th Mag, a little decreafed" by the removal of the 

 brightcfl fpot E, the h being much lefs. 



Fig. 4. *' Jul^ 19M, 16 dai/s or I rotation 5.6 Mag.jlill de^ 

 cieafed,'* N being much lefs than h, now gone off. A /light 

 minimum." 



Fig' 5. *'Jitli/ 21th, 8 dai/f! of the rotation, 5 Mag. rathey 

 increaftd" by tlie confiderable increafe of N fince four days,. 

 with the addition of F, a Jlightfull brightucfs. 



F?g. 6. •* Aug, 3d, 7 da;^,s of rotation, 5,6 Mag. decreafed by 

 the going off of N, the E, which is now reappearing, being 

 reduced to much lefs than F. 



Fig. 7. " /l'-/g. I9th, 16 dai/s or J rotation, 5.6 Mag. again 

 decreafed," by the removal of F, by E being much lefs, and by 

 the h alfo being confiderably diminilhed. 



Fig, 8. •* Sept od, 1 5 days or | rotation, 6 Mag. Jiill more 

 decreafed,'* by the h being much lei's than E, which is now 

 going off, and N fcarcely reappearing, another minimum. 



Fig. 9. ** Sept. \lth, 14 daj/sornear \ rotation, 5 Mag. full 

 brightnefs cotifidcrably increafed,'* by N having retained ils in^ 

 creafed brightnefs of July 27, and now facing us centrally^ 



1(1, Thus are exiiibited, the two (liort intervals of its full 

 1 rightnefs, one between June 18 and July 27, of 59 days, and 

 the other between July 27 and Sept. 17, of 52 days. See 

 1 able IX. 



2dlv, 



