ffirms;

1. That with a _Telescope_ of 24. _Palmes_, or of about 16 _Foot_, wrought
after S. _Campani's_ way, he began to observe _February_ 6. 1666 (st.n.) in
the morning, and saw two dark Spots in the _first_ Face of _Mars._ {243}

2. That with the same Glass he observ'd _Febr._ 14/24. in the Evening, in
the _other_ Face of this Planet, two other Spots, like those of the first,
but bigger.

3. That afterwards continuing the Observations, he found the Spots of these
two Faces to turn by little and little from _East_ to _West_, and to return
at last to the same situation, wherein he had seen them first.

4. That S. _Campani_, having also observ'd at _Rome_ with Glasses of 50.
_Palmes_ or about 35 _Foot_, likewise of his own contrivance, had seen in
the same Planet the same _Phenomena_.

5. That sometimes he hath seen, during the same night, the two Faces of
_Mars_, one, in the Evening, the other in the Morning.

6. That the Motion of these Spots in the inferior part of the apparent
Hemisphere of _Mars_, is made from _East_ to _West_, as that of all the
other Celestial Bodies, and is peform'd by Parallels, that decline _much_
from the _Equator_, and _little_ from the _Ecliptick_.

7. That the Spots return the next day to the same situation, 40. minuts
later, than the day before; so that in every 36. or 37. daies, about the
same hour, they come again to the same place.

8. He promises shortly to give us the particular _Tables_ of this Motion
and of its Inequalities, together with the _Ephemerides_ themselves.

9. He represents, that some other _Astronomers_ have also made at _Rome_
several Observations of these Spots of _Mars_, from _March 14/24._ to
_March 20/30._ with Glasses, wrought by _Eustachio Divini_, of 25. and 45.
Palmes; Which Spots he makes little differing from his own, of the first
Face; as will by and by appear, by the direction to the _Schemes_.

10. But he adds, that those other _Roman_ Astronomers, that have observ'd
with _Divini's_ Glasses, will have the Conversion of _Mars_ to be
performed, not in 24 h, 40 m. (as he maintains it is) but in about 13 h.

11. And to evince, that they are mistaken in these Observations of theirs;
he alledges, That they assure that the Spots, which they have seen in this
Planet, (by an _Eustachian_ Telescope) the 20/30 of _March_, were small,
very distant from one another, remote from the middle of the Disk, and the
_Oriental_ Spot was less, than the _Occidental_