Printed with Licence for _John Martyn_, and _James Allestry_, Printers to the Royal-Society. 1666. {231} * * * * * _Num._ 14. PHILOSOPHICAL _TRANSACTIONS._ * * * * * _Munday_, _July_ 2. 1666. * * * * * The Contents. _An Account of a _New_ kind of _Baroscope_, which may be call'd _Statical_; and of some Advantages and Conveniencies it hath above the _Mercurial_; communicated by Mr. _Boyle_. The Particular Observations of the Planet _Mars_, formerly intimated to have been made by Mr. _Hook_ in _February_ and _March_ last. Some Observations, made in _Italy_, confirming the former; and withall fixing the _Period_ of the said Planet's Revolution. Observations, lately made at _London_, of the Planet _Jupiter_: as also of _Saturn_. A Relation of a sad Effect of Thunder and Lightning. An Account of some Books, lately publish'd; _videl_. The Relations of divers Curious Voyages, by Mons. _Thevenot_: A Discourse about the Cause of the Inundation of the _Nile_, by Mons. _de la Chambre_, both _French_: De Principiis & Ratiocinatione Geometrarum, Contra Fastum Professerum Geometriae, by Mr. _Hobbes_: King _Salomons_ Pourtraiture of Old Age, by_ J. Smith, M. D. * * * * * _An Account of a _New_ kind of _Baroscope_, which may be called _Statical_; and of some Advantages and Conveniencies it hath above the _Mercurial_: Communicated, some while since, by the Honourable _Robert Boyle_._ [Sidenote: * See _Num. 11. p. 185. Phil. Transactions._] As for the _New_ kind of _Baroscopes_, which, not long agoe, * I intimated to you, that my haste would not permit me to give you an account off; since your Letters acquaint me, that you still design a Communicating to the {232} Curious as much Information, as may be, in reference to _Baroscopes_; I shall venture to send you some Account of what I did but name (in my former Letter) to you. [Sidenote: * _The Scales here meant were before competent Eyewitnesses made to turn manifestly with the thousandth part of a grain._]