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brighter Parts than any other Parts of the Sun. Thefe 
PauI# I have ,obferv’d never continue long on the Sun : 
And tbe -ieafon I conceive is, becaufe the Vulcano, after 
its Smoak is over, doth not long emit its Flames 3 by 
realon the. fiery Pabulum is then near fpent, when once 
it begins to flame : After which the torrid Vulcano fooa 
retu^neth to the Natural Temperature of the Sun, fo 
nearly at leaf! as to elcape cur fight, at fo vaft a di- 
fiance as the Sun is from us. 
Another thing that may be accounted for, and in- 
deed doth in fome meafure confirm alfo what I have 
fa id, is the Nuclei , or darker part of the Spots 5. gene- 
rally in- moft Spots, and towards the middle of ‘them, 
Now it is very ufual in Culinary Fires in this our Globe* 
when they emit Smoak, tha't the middle is the darktft 
part. If, for inftande, we were from aloft in the Air, 
to fee a thick Smnak come tumbling out of a Chimney, cf 
the Mouth of a Vulcano juft kindled, we fliould find the 
middle parr, juft over the Mouh of the chimney, or 
Vulcano , to be the moft fpifs and dark, and towards the 
extremes clearer and thinner. And fo l take it to be 
in the Erup.ions of the Sun ^ that the Nucleus is juft 
Qver the Mouth of the ignivomous Cavern, and that 
ttie mifty Parts of the Spot are the thinner Parts of the 
Smoak, Tvimming about in that Fluid, or dtmofphere; 
which I fuppofe doth furround the Sun, as well as our 
Globe, and the Moon manifeftly$ yea, and in all pro- 
bability, every Planet of this cur Solar Syftem. 
From what hath been Paid, we may give a reafon 
why there are fometimes Spots frequently on the Sun, 
and fometimes none in many Years. One thing I be^ 
lieve thefe is in this, That there maybe Spots, but not 
always feen. But there are doubtlefs great Intervals 
fometimes when the Sun is free ; as between the Years* 
1660 and 1671, 1676 and 1684. In which time Spots 
could hardly efcape the fight of fo m a ay curious Ob- 
fe.mn- 
