6. The State of the Weather, as to Rain, Hail, Mist, Haziness, &c, and the times of its Changes. 7. At the times of observation of the Tides, the height of the _Thermometer_; the height of the _Baroscope_; the height of the _Hygroscope_; the Age of the Moon, and her _Azimuths_; and her place in all respects; And lastly the _Sun's_ place; all these to _minutes_. And it would be convenient, to keep _Journal Tables_, for all these Observations, each answering to its day of the Month. For the _Apparatus_ of all these observations, there will be particularly necessary. A good _Pendulum_-watch. A _Vane_ shewing _Azimuths_ to minute parts. An _Intrument_ to measure the Strength of the Winde. A large and good _needle_ shewing _Azimuths_ to degrees. {301} _Thermometers_, _Barometers_, _Hygroscopes_. These Observations being thought very considerable as well as curious, 'tis hoped, that those who have conveniency, will give encouragement and assistance for the making of them; and withall oblige the publick by imparting, what they shall have observed of this kind: The _Publisher_ intending, that when ever such observations shall be communicated to him, he will give notice of it to the _publick_, and take care of the improvement thereof to the best use and advantage. A _Pattern_ of the _Table_, proposed to be made for observing the _Tides_, is intended to be published the next opportunity, God permitting. * * * * * _An Account of Several Books lately published_ I. _Johannis Hevelii DESCRIPTIO COMETAE, Anno AErae Christianae MDCLXV. exorti; una cum MANTISSA Prodromi Cometici, Observationes omnes prioris COMETAE MDCLIV, ex iisque genuinum motum accurate deductum, cum Notis & Animadversionibus, exhibens._