13th—An artificial Eye, in which all the Coats and Humours are curiously represented.
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.
15th—A particular _Apparatus_ to manifest and measure the Refraction of Air.
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.
Experiments concerning the blending and Production of Colours by Motion.
16th Day. That Fluids gravitate _in proprio loco_, the upper Parts continually pressing upon the lower: That this Pressure is not only propagated Downwards, but even Upwards, and Sideways, according to all possible Directions; That a lighter Fluid may gravitate upon a heavier, and an heavier upon a lighter; That a Fluid may sustain a Body heavier _in Specie_ than it self, and even raise it up; That a Fluid may detain a Body lighter _in Specie_ than it self, and even depress it. A general Experiment to prove, that a competent Pressure of a Fluid may produce the remarkable Phænomena of the Torricellian Tube, the Pump, Syringe, Syphon, polished Plates, and other Effects of the like Nature.
17th—That Fluids press according to their perpendicular Altitudes, whatever be their Quantities, or however the containing Vessels be figured. The exact Estimate of all manner of Pressures. That the Velocity and Quantity of Fluids running out at a given Hole, is in the subduplicate Proportion of their perpendicular Altitudes. Several Sorts of Pumps. Of the sinking and floating of Bodies immers'd in Fluids; their relative Gravities and Levities; their Situations and Positions. The Phænomena of Glass Bubbles and Images accounted for.