It having been already intimated (Num. 8 of Phil. Transact. p. [140]. [141].) that divers Philosophers aime, among other things, at the Composing of a good Natural History, to superstruct, in time, a Solid and Useful Philosophy upon; and it being of no slight importance, to be furnisht with pertinent Heads, for the direction of Inquirers; that lately named Benefactour to Experimental Philosophy, has been pleased to communicate, for the ends abovesaid, the following Articles, which (as himself did signifie) belong to one of his Essays of the unpublisht part of the Usefulness of Nat. and Experimen. Philosophy.

But first he premises, that what follows, is design'd only to point at the more General heads of Inquiry, which the proposer ignores not to be Divers of them very comprehensive, in so much, that about some of the Subordinate subjects, perhaps too, not the most fertile, he has drawn up Articles of inquisition about particulars, that take up near as much room, as what is here to be deliver'd of this matter.

The Heads themselves follow;

The things, to be observ'd in such a History, may be variously (and almost at pleasure) divided: As, into Supraterraneous, Terrestrial, and Subterraneous; and otherwise: but we will at present distinguish them into those things, that respect the Heavens, or concern the Air, the Water, or the Earth.

1. To the First sort of Particulars, belong the Longitude and Latitude of the Place (that being of moment in reference to the observations about the Air &c.) and consequently the length of the longest and shortest days and nights, the Climate, parallels &c. what fixt starrs are and what not seen there: What Constellations 'tis said to be subject to? Whereunto may be added other Astrological matters, if they be thought worth mentioning.

2. About the Air may be observ'd, its Temperature, as to the first four Qualities (commonly so call'd) and the Measures of them: its Weight, Clearness, Refractive power: its Sublety or Grossness: its abounding with, or wanting an Esurine Salt: its variations according to the seasons of the year, and the times of the day; What duration the several kinds of Weather usually have: What Meteors it is most or least wont to breed; and in what order they are generated; and how long they usually last: Especially, what Winds it is subject to; whether any of them be stated and ordinary, &c. What diseases are Epidemical, that are supposed to flow from the Air: What other diseases, wherein that hath a share, the Countrey is subject to; the Plague and Contagious sicknesses: What is the usual salubrity or insalubrity of the Air; and with what Constitutions it agrees better or worse, than others.

3. About the Water, may be observ'd, the Sea, its Depth, degree of Saltness, Tydes, Currents, &c. Next, Rivers, their Bigness, Length, Course, Inundations, Goodness, Levity (or their Contraries) of Waters, &c. Then, Lakes, Ponds, Springs, and especially Mineral waters, their Kinds, Qualities, Vertues, and how examined. To the Waters belong also Fishes, what kinds of them (whether Salt or Fresh-water fish) are to be found in the Country; their Store, Bigness, Goodness, Seasons, Haunts, Peculiarities of any kind, and the wayes of taking them, especially those that are not purely Mechanical.

4. In the Earth, may be observed,

1. It self.

2. Its Inhabitants, and its Productions, and these External, and Internal.