the one place to the other. What other places in the
Country it was observed at, I have not been informed: but at _Oxford_
(which, it seems, was about the skirts of it) it was so small, as would
have been hardly noted at all, had not the notice, taken of it abroad,
informed us of it.

Upon this Occasion, it will not be unseasonable to give some General
accounts of what I have in my _Thermoscope_ and _Baroscope_ observed.

My _Thermoscope_, being fitted somewhat at adventures, I have found at the
lowest to be somewhat more than 12. inches high, in the fiercest time of
the long Frost in the beginning of the last year 1665. and about 27. Inches
high, at the highest, in the hottest time of the last Summer: (which I
mention, that it may appear at what temperature in proportion, the Air was
at the time above-mentioned.) But I must add withall, that this standing
so, as never to be exposed to the Sun, but in a room, that has a window
only to the North, it would have been raised much higher than 27. inches,
if it were put in the hot Sun-shine in Summer; this, as it is placed,
giving therefore an account onely of the Temperature of the Air in
_general_, not of the immediate heat of the Sun-shine.

This Instrument, thus situated, when it is about 15. inches, or lower, is
for the most part hard frost; but seldom a frost, if higher than 16. Yet
this I have often observed, that the Air by the _Thermoscope_ has appeared
considerably colder (and the liquor lower) at sometimes when there is no
Frost, than at some other times, when the Frost hath been considerably
hard. {170}

In my _Baroscope_, I have never found the Quicksilver higher than 30.
inches, nor lower than 28. (at least, scarce discernably, not 1/16 of an
inch higher than _that_, or lower than _this_;) which I mention, not only
to shew the limits, within which I have observed mine to keep, _vid._ full
2 inches, but likewise as an Estimate of the Clearness of the Quicksilver
from Air. For, though my Quicksilver were with good care cleansed from the
Air; yet I find that which Mr. _Boyle_ useth, much better: for, comparing
his with mine at the same times, and both in _Oxford_, at no great
distance; I find his Quicksilver to stand alwaies somewhat higher than mine
(sometimes neer a quarter of an Inch;) which I know now how to give a more
probable account off, than that my Quicksilver is either heavier than his;
or else, that his is better cleansed from Air, (unless, possibly,