7th—The Laws of Motion in the Collision of Hard and Elastick Bodies. Experiments concerning the Centrifugal and Centripetal Forces of Solid and Fluid Bodies in Motion. Experiments in order to estimate the Centrifugal Forces of Solid Bodies. MAGNETICKS. 8th Day. Attractive and Directive Powers of Loadstones. The Form or Position of Filings of Iron at the Poles and Equator of a Loadstone. Magnetick Power acts thro' all Bodies but Iron. The Attraction of different, and Repulse of corresponding Poles. The manner of touching and untouching of Needles. The Law of Magnetick Attraction discover'd. 9th—The Phænomena of _Terrella_, or Spherical Loadstones. The Direction of Magnetick Needles on the Surfaces of _Terrella_ nearly towards the Poles. Their Variation _East_ and _West_. The Inclinatory or Dipping-Needle, with the Law of the Alteration of that Inclination on the Surface of a _Terrella_. The Terrestrial Magnetism consider'd. The Application of the Dipping-Needle to the Discovery of the Longitude and Latitude of Places by Land and Sea. OPTICKS. 10th Day. Experiments to demonstrate, that in the Rays of Light the Angle of Incidence is equal to the Angle of Reflection in all Sorts of Surfaces. The Method of tracing the reflected Rays of Light from Plain, Convex, Concave, and Cylindrical Superficies, with all their wonderful Properties and Uses, shew'd and explain'd. 11th—Sir _Is. Newton_'s Reflecting Telescope exhibited, and its Construction explained; together with some Specimens of its Uses in observing the Planets and Fixed Stars. 12th—Experiments to shew the Manner of Refraction. The Sines of the Angles of Incidence and Refraction, shewn to be (at all Degrees of Incidence) in a constant Proportion to each other. An Instrument to measure the Refraction of Fluids. The Method of tracing the Refracted Rays of Light thro' Plain, Convex, and Concave Superficies. 13th—An artificial Eye, in which all the Coats and Humours are curiously represented. The Dissection of the Eye. The Explication of Vision by the naked Eye, deduced from Experiments. 14th—All the Effects, Properties, and Uses of Plain, Convex, and Concave Glasses, both single and combin'd in Telescopes and Microscopes, shew'd and explain'd. Several Kinds of Microscopes and Telescopes, with the Manner of applying them to their respective Objects; together with a Specimen of the Uses of such Microscopes and Telescopes. A Multiplying Glass. The Magick Lanthorn. 15th—A particular _Apparatus_ to manifest and measure the Refraction of Air. The _Camera Obscura_. The Theory of Light and Colours, as delivered by Sir _Isaac Newton_, demonstrated by several of his principal Experiments. The Archbishop of _Spalato_'s Experiment, which discovered the Cause of the Rainbow. Monsieur _Hugen_'s Experiments, which discover the Causes of Halo's, of the Mock Suns and Moons, and of inverted Rainbows.