And I have sometimes thought, whether it might not be, that all the Seas of the _Moon_, if there must be Seas, were on the side of the other _Hemisphere_, and that for this cause it might be that the _Moon_ turns not upon its _Axis_, as our _Earth_, {122} wherein the Lands and Seas are, as it were, ballanced: That thence also may proceed the non-appearance of any Clouds raised there, or of any Vapors considerable enough to be seen, as there are raised upon this Earth; and that this absence of Vapors is perhaps the cause, that no _Crepuscle_ is there, as it seems there is none, my selfe at least not having hitherto been able to discerne any mark thereof: For, me thinks, it is not to be doubted, but that the reputed Citizens of the _Moon_ might see our _Crepuscle_, since we see, that the same is without comparison stronger, than the _Light_ afforded us by the _Moon_, even when she is _full_; for, a little after Sun-set, when we receive no more than the _first_ Light of the _Sun_, the sky is far clearer, than it is in the fairest night of the _full Moon_. Mean while, since we see in _the Moon_, when she is increasing or decreasing, the Light she receives from the Earth, we cannot doubt, but that the People of the _Moon_ should likewise see in the _Earth_ that Light, wherewith the _Moon_ illuminates it, with perhaps the difference, there is betwixt their bigness. Much rather therefore should they see the Light of the _Crepuscle_, being, as we have said, incomparably greater. In the mean time we see not any faint Light beyond the _Section_ of the Light, which is every where almost equaly strong, and we there distinguish nothing at all, not so much that cleerest part, which is called _Aristarchus_, or _Porphyrites_, as I have often tryed; although one may there see the Light, which the _Earth_ sends thither, which is sometimes so strong, that in the _Moon's_ decrease I have often _distinctly_ seen _all_ the parts of the _Moon_, that were _not enlightned_ by the _Sun_, together with the difference of the clear parts, and the Spots, so far as to be able to discern them all. The _Shaddows_ also of all the _Cavities_ of the _Moon_ seem to be stronger, than they would be, if there were a _Second_ Light. For, although a far off, the shaddows of our Bodies, environed with Light, seem to Us almost dark; yet they doe not so appear so much, as the Shaddows of the _Moon_ doe; and those that are upon the _Edge_ of the _Section_, {123} should not appear in the like manner. But, I will determine nothing of any of these things. When I shall hereafter have made more frequent Observations of the Moon with my _great Telescopes_, in convenient time, I shall then perhaps learn more of it, than I know at present, at least it will excite the _Curious_ to endeavor to make the like Observations; and it may be, others, that I have not thought of. * * * * *