HERSCHEL. 203 



1801. Phil. Trans., vol. xci. — Observations tending to investigate the nature of the 

 sun, in order to lindthe causes or symptoms of its variable emission of light and heat; 

 with remarks on the use that may possibly be drawn from solar observations. — Addi- 

 tional observations tending to investigate the symptoms of the variable emission of the 

 light and heat of the sun ; with trials to set aside dai-keuing glasses, by transmitting 

 the solar rays through liquids, and a few remarks to remove objections that might be 

 made against some of the arguments contained in the former paper. 



1802. riiil. Trans., vol. xcii. — Observations on the two lately discovered celestial 

 bodies, (Ceres and Pallas.) — Catalogue of 500 new nebula; and clusters of stars, with re- 

 marks on the construction of the heavens. 



1803. riiU. Trans., vol. sciii. — Observations of the ti'ansit of Mercury over the disk of 

 the sun ; to which is added an investigation of the causes which often prevent the 

 proper action of mirrors. — Account of the changes that have happened during the last 

 weuty-five years in the relative situation of double stars ; with an investigation of 

 the cause to which they are owing. 



1804. Phil. Trans., vol. xciv. — Continuation of an account of the changes that have 

 happened in the relative situation of double stars. 



1805. Phil. Trans., vol. xcv. — Experiments for ascertaining how far telescopes will 

 enable us to determine very small angles, and to distinguish the real from the spurious 

 diameters of celestial and terrestrial objects; with an application of the result of these 

 experiments to a series of observations on the nature and magnitude of Mr. Harding's 

 lately discovered star. — On the direction and velocity of the motion of the sun and solar 

 system. — Observation on the singular figure of the planet Saturn. 



1806. Phil. Trans., vol. xcvi. — On the quantity and velocity of the solar motion. — 

 Observations on the figure, the climate, and the atmosphere of Saturn and its ring. 



1807. Phil. Trans., vol. xcviii Experiments for investigating the cause of the colored 

 concentric rings discovered bj Sir Isaac Newton between two object-glasses laid one 

 upon another. — Observations on the nature of the new celestial body discovered by 

 Dr. Olbers, and of the comet which was expected to appear last January, in its return 

 from the sun. 



1808. Phil. Trans., vol. xcviii. — Observations of a comet, made with a view to investi- 

 gate its magnitude and the nature of its illumination. To which is added an account 

 of a new irregularity lately perceived in the apparent figure of the jilanet Saturn. 



1809. Phil. Trans., vol. xcis. — Continuation of experiments for investigating the 

 cause of colored concentric rings and other appearances of a similar nature . 



1810. Phil. Trans., vol. c. — Supplement to the first and second part of the paper of 

 experiments for investigating the cause of colored concentric rings between object- 

 glasses, and other aj)pearances of a similar nature. 



1811. PhiJ. Trans., vol. ci. — Astronomical observations relating to the construction 

 of the heavens, arranged for the purpose of a critical examination, the result of which 

 appears to throw some new light upon the organization of the celestial bodies. 



1812. Pliil. Trans., vol. cii. — Observations of a comet, with remarks on the construc- 

 tion of its difi'erent parts. — Observations of a second comet, with remarks on its con- 

 struction. 



1814. Phil. T)'ans., vol. civ. — Astronomical observations relating to the sidereal part 

 of the heavens, and its connection with the nebulous part ; arranged for the purpose of 

 a critical examination. 



1815. Phil. Trans., vol. cv. — A series of observations of the satellites of the Georgian 

 Planet, including a passage through the node of their orbits ; with an introductory ac- 

 count of the telescopic apparatus that has been used on this occasion, and a final expo- 

 sition of some calculated particulars deduced from the observations. 



1817. Pliil. Trans., vol. cvii. — Astronomical observations and experiments tending to 

 investigate the local arrangement of the celestial bodies in space, and to determine the 

 extent and condition of the Milky Way. 



1818. Phil, Trans., vol. cviii.— Astronomical observations and exiierimeuts selected 



