On the 19. of _January_ 1665. _Stylo Angliae_ (or _Jan._ 29. 1666. _stylo novo_) at divers places neer _Oxford_, was observed a small _Earthquake_ (as at _Blechington, Stanton-St. Johns, Bril_, &c.) towards evening. In _Oxford_ it self, I doe not hear, that it was observ'd to be an Earthquake; yet I remember about that time (whether precisely then or not; I cannot say) I took notice of some kind of odde shaking or heaving I observed in my study, but did impute it to the going of Carts or Coaches, supposed to be not far off; though yet I did take notice of it, as a little differing from what is usual on such occasions; (and wondered the more, that I did not hear any:) But not knowing, what else to refer it to, I thought no more of it. And the like account I have had from some others in _Oxford_, who yet did not think of an Earth-quake; it being a rare thing with us. Hearing afterwards of an Earthquake observed by others; I looked on my Notes concerning my _Thermoscope_ and _Baroscope_, to see if any alteration considerable had then happened. My _Thermoscope_ consists of a round large Glass, containing about half a pint or more; from whence issues a long Cylindrical neck of Glass, about two foot and a half in length, and less than a quarter of an inch diameter; which neck was _hermetically_ sealed at the top, to exclude communication with the External Air; but before the sealing of it, the whole Glass was filled with _Spirit of Wine_ (tinged with _Cochineel_, to make it the more discernable to the Eye) so warmed, that it filled the whole content of the Glass; but afterwards, as it cooled, did so subside, as to leave a void space in the upper part of the Neck. Which Instrument, so prepared, doth by the rising or falling of the tinged liquor in the neck (consequent upon the expanding or contracting of the whole liquor contained in it and the Ball below) give a very nice account of the Temperature of the Air, {167} as to _Heat_ or _Cold_: Even so nice, as that my being or not being in my Study I find to vary its hight sometimes almost a quarter of an inch.