6. To take notice of the Nature of the Ground at the bottom of the Sea, in all Soundings, whether it be Clay, Sand, Rock, &c.
7. To keep a Register of all changes of Wind and Weather at all houres, by night and by day, shewing the point the Wind blows from, whether strong or weak: The Rains, Hail, Snow and the like, the precise times of their beginnings and continuance, especiall Hurricans and Spouts; but above all to take exact care to observe the Trade-Winds, about what degree of Latitude and Longitude they first begin, where and when they cease, or change, or grow stronger or weaker, and how much; as near and exact as may be.
8. To observe and record all Extraordinary Meteors, Lightnings, Thunders, Ignes fatui, Comets, &c. marking still the places and times of their appearing, continuance. &c.
9. To carry with them good Scales, and Glasse-Violls of a pint or so, with very narrow mouths, which are to be fill'd with Sea-water in different degrees of Latitude, as often as
they please, and the weight of the Vial full of water taken exactly at every time, and recorded, marking withall the degree of Latitude, and the day of the Month: And that as well of water near the Top; as at a greater Depth.
Some Observations concerning Jupiter. Of the shadow of one of his Satellites seen, by a Telescope passing over the Body of Jupiter.
I have received an Account from very good hands, That on the 26th. of September last, at half hour after seven of the Clock, was seen, both in Holland and in France (by curious Observers, with very good Telescopes) the shadow of one of the Satellites of Jupiter, passing over his Body. One of those small Stars moving about his Body (which are therefore called his Satellites) coming between the Sun and it, made a small Eclipse, appearing in the Face of Jupiter as a little round black Spot. The Particulars of those Observations, when they shall come to our Hands, we may (if need be) make them publik: Which Observations, as they are in themselves very remarkable, and argue the Excellency of the Glasses by which they were discovered; So are we, in part, beholding to Monsieur Cassini for them, who giving notice before hand of such Appearances to be expected, gave occasion to those Curious Observers to look for them.