on us by the reflection of the Sunne-beames from the superficies of
her body, or else by her owne illumination. Some there are who affirme
this latter part. So _Averroes_, _Caelius Rhodiginus_, _Iulius Caesar_,
_&c._ and their reason is because this light is discerned in many
places,[1] whereas those bodies which give light by reflexion can there
onely be perceived where the angle of reflexion is equall to the angle
of incidence, and this is onely in one place, as in a looking-glasse
those beames which are reflected from it cannot bee perceived in every
place where you may see the glasse, but onely there where your eye is
placed on the same line whereon the beames are reflected.

[Sidenote 1: _De coelo. l. 2. com. 49._
_Ant. lection. l. 20. c. 4._
_De phaenom. lunae. c. 11._]

But to this I answere, that the argument will not hold of such bodies,
whose superficies is full of unequall parts and gibbosities as the Moone
is. Wherefore it is as well the more probable as the more common
opinion, that her light proceedes from both these causes, from reflexion
and illumination; nor doth it herein differ from our earth, since that
also hath some light by illumination: for how otherwise would the parts
about us in a Sunne-shine day appeare so bright, when as all the rayes
of reflexion cannot enter into our eye?

2. It is compact, and not a spungie and porous substance.[1] But this is
denied by _Diogenes_, _Vitellio_, and _Reinoldus_, and some others, who
held the Moone to bee of the same kind of nature as a Pumice-stone, and
this, say they, is the reason why in the Suns eclipses there appeares
within her a duskish ruddy colour, because the Sunne-beames being
refracted in passing through the pores of her body, must necessarily be
represented under such a colour.

[Sidenote 1: _Plut. de pla. phil. l. 2. c. 13._
_Opt. l. 4._
_Com. Purbac. Theo. p. 164._]

But I reply, if this be the cause of her rednesse; then why doth she not
appeare under the same forme when she is about a sextile aspect, and the
darkned part of her body is discernable? for then also doe the same
rayes passe through her, and therefore in all likelihood should produce
the same effect, and notwithstanding those beames are then diverted from
us, that they cannot enter into our eyes by a streight line, yet must
the colour still remaine visible in her body,[1] and besides according
to this opinion, the spots would not alwaies be the same, but divers,