* _Those _Five_ Suns, that appear'd the 29 _March_, A. 1629. at
_Rome_, between 2 or 3 of the Clock, in the afternoon, were thus posited;
that the two of them, which were in the intersection of two Circles,
appear'd in that of a Circle, which passed through the Sun's Diske, with
another, that was _Concentrick_ to the Sun: as may be seen in _Figure III_.
borrow'd (for the easier comparing them together) out of _Des-Cartes_ his
_Meteors_, cap. X._]

This Appearance is look't upon as one of the notablest, that can be seen,
by reason of the _Excentricity_ of the Circle H D N, and because that the
_Parhelia_ * were not in the Intersection of the Circle D E B O with the
great Circle S C H N, but in that of the Semi-circle H D N.

As for the two odd _Rainbows_; they appear'd at _Chartres_ the 10. of
_August_, 1665. about half an hour past six in the Evening; and did cross
one another almost at right Angles, as may be seen by _Fig._ IV.

[Illustration]

The Rainbow, which was opposite to the Sun, in the usual manner, was more
deeply colour'd, than that, which cross'd it; though even the Colours of
the first _Iris_ were not so strong, as they are now and then seen at other
times.

The greatest height of the stronger Rainbow, was about 45. degrees; the
feebler Rainbow lost one of its Legs, by growing fainter, about 20 degrees
above the stronger; and the Leg below appear'd continued to the _Horizon_.

These Rainbows did not _Just_ decussate one another at right Angles; there
was some 6 or 7 degrees difference. The fainter, seem'd to be a Portion of
a great Circle; and the stronger was but a Portion of a small Circle, as
usually.

The Sun, at their appearance, was about 6 degrees high above the _Horizon_,
and towards the 17 _Azimuth_ of the West, Northward.

{222}

The Observer, M. _Estienne_, notes, that, when he made this Observation,
the River of _Chartres_, which runs very near from _South_ to _North_, was
betwixt him and the Rainbow; and that he stood Level with this River,
whence he was distant not above 150 paces: which he adds, that the Curious
may the better judge of this Observation.

* * * * *

_A Relation of an Accident by Thunder and Lightning, at _Oxford_._

This was imparted by Dr. _Wallis_ in a Letter, written at _Oxford_, May 12,
1666. to the _Publisher_, as follows:

I should scarce have given you so soon the trouble of another Letter, were
it not for an Accident whic