1796. _Phil. Trans._, vol. lxxxvi.--Method of observing the Changes that happen to the Fixed Stars; Remarks on the Stability of our Sun's Light.--Catalogue of Comparative Brightness, to determine the Permanency of the Lustre of Stars.--On the Periodical Star _a_ Herculis, with Remarks tending to establish the Rotatory Motion of the Stars on their Axes; to which is added a second Catalogue of the Brightness of the Stars. 1797. _Phil. Trans._, vol. lxxxvii.--A Third Catalogue of the comparative Brightness of the Stars; with an Introductory Account of an Index to Mr. Flamsteed's Observations of the Fixed Stars, contained in the Second Volume of the Historia Coelestis to which are added several useful Results derived from that Index.--Observations of the changeable Brightness of the Satellites of Jupiter, and of the Variation in their apparent Magnitudes; with a Determination of the Time of their rotary Motions on their Axes, to which is added a Measure of the Diameter of the Second Satellite, and an Estimate of the comparative Size of the Fourth. 1798. _Phil. Trans._, vol. lxxxviii.--On the Discovery of Four additional Satellites of the Georgium Sidus. The retrograde Motion of its old Satellites announced; and the Cause of their Disappearance at certain Distances from the Planet explained. 1799. _Phil. Trans._, vol. lxxxix.--A Fourth Catalogue of the comparative Brightness of the Stars. 1800. _Phil. Trans._, vol. xc.--On the Power of penetrating into Space by Telescopes, with a comparative Determination of the Extent of that Power in Natural Vision, and in Telescopes of various Sizes and Constructions; illustrated by select Observations.--Investigation of the Powers of the Prismatic Colours to heat and illuminate Objects; with Remarks that prove the different Refrangibility of radiant Heat; to which is added an Inquiry into the Method of viewing the Sun advantageously with Telescopes of large Apertures and high magnifying Powers.--Experiments on the Refrangibility of the Invisible Rays of the Sun.--Experiments on the Solar and on the Terrestrial Rays that occasion Heat; with a comparative View of the Laws to which Light and Heat, or rather the Rays which occasion them, are subject, in order to determine whether they are the same or different.