On the third of _March_, though the Air were still bad enough yet I could see now and then the Body of _Mars_ appearing of the form A: which I presently described by a _Scheme_; and about 10. minutes after, as exactly representing what I saw through the Glass, as I could, I drew the _Scheme_ B. This I was sufficiently satisfied (by very often observing it through the Tube, and changing my Eye into various positions, that so there might be no kind of Fallacy in it) could be nothing else, but some more _Dusky_ and _Spotted_ parts of the Face of this Planet. _March_ 10. finding the Air very bad, I made use of a very shallow Eye-glass, as finding nothing _Distinct_ with the greater _Charge_; and saw the appearance of it as in C, which I imagin'd, might be the Representation of the former Spots by a lesser charge. About 3 of the Clock the same morning, the Air being _very bad_ (though to appearance _exceeding clear_, and causing all the Stars to twinckle, and the minute Stars to appear very thick) the body seem'd like _D_; which I still suppos'd to be {241} the Representation of the same Spots through a more confused and glaring Air. But observing _March_ 21. I was surprised to find the Air (though not so clear, as to the appearance of small Stars) so _exceeding transparent_, and the Face of _Mars_ so very well _defined_, and round, and distinct, that I could manifestly see it of the shape in E. about half an hour after Nine at night. The _Triangular_ spot on the right side (as it was inverted by the Telescope, according to the appearances, through with all the preceeding _Figures_ are drawn) appear'd very black and distinct, the other towards the left more dim; but both of them sufficiently plain and defin'd. About a quarter before 12. of the Clock the same night, I observ'd it again with the same Glass, and found the appearance exactly, as in F; which I imagin'd to shew me a _Motion_ of the former triangular spot: But designing to observe it again about 3. of the Clock the same Morning, I was hindred by cloudy weather. But _March_ 22. about half an hour after 8. at night, finding the same Spots in the same posture, I concluded, that the preceeding Observation was only the appearance of the same Spots at another height and thickness of the Air: And thought my self confirm'd in this Opinion, by finding them in much the same posture, _March_ 23. about half an hour after 9. though the Air was nothing so good as before.