_Note to_ “IS THE HEAT OF THE SUN DECREASING?” _at page 65_.--Dr. Vaughan of Cincinnati has stated to the British Association: “From a comparison of the relative intensity of solar, lunar, and artificial light, as determined by Euler and Wollaston, it appears that the rays of the sun have an illuminating power equal to that of 14,000 candles at a distance of one foot, or of 3500,000000,000000,000000,000000 candles at a distance of 95,000,000 miles. It follows that the amount of light which flows from the solar orb could be scarcely produced by the daily combustion of 200 globes of tallow, each equal to the earth in magnitude. A sphere of combustible matter much larger than the sun itself should be consumed every ten years in maintaining its wonderful brilliancy; and its atmosphere, if pure oxygen, would be expended before a few days in supporting so great a conflagration. An illumination on so vast a scale could be kept up only by the inexhaustible magazine of ether disseminated through space, and ever ready to manifest its luciferous properties on large spheres, whose attraction renders it sufficiently dense for the play of chemical affinity. Accordingly suns derive the power of shedding perpetual light, not from their chemical constitution, but from their immense mass and their superior attractive power.” PLANETOIDS. +----------------+---------------+-----------+-----------+-----------+ | | | | | No. | | | | | |discovered | | | Date of | | Place of | by each | | Name. | Discovery. |Discoverer.| Discovery.|astronomer.| +----------------+---------------+-----------+-----------+-----------+ |Mercury, Mars, }| Known } | | | | |Venus, Jupiter,}| to the } | ... | ... | -- | |Earth, Saturn, }| ancients.} | | | | | Uranus |1781, March 13 |W. Herschel| Bath | -- | | Neptune[59] |1846, Sept. 23 |Galle | Berlin | -- | | 1 Ceres |1801, Jan. 1 |Piazzi | Palermo | 1 | | 2 Pallas |1802, March 28 |Olbers | Bremen | 1 | | 3 Juno |1804, Sept. 1 |Harding | Lilienthal| 1 | | 4 Vesta |1807, March 29 |Olbers | Bremen | 2 | | 5 Astræa |1845, Dec. 8 |Encke | Driesen | 1 | | 6 Hebe |1847, July 1 |Encke | Driesen | 2 | | 7 Iris |1847, August 13|Hind | London | 1 | | 8 Flora |1847, Oct. 18 |Hind | London | 2 | | 9 Metis |1848, April 25 |Graham | Markree | 1 | |10 Hygeia |1849, April 12 |Gasperis | Naples | 1 | |11 Parthenope |1850, May 11 |Gasperis | Naples | 2 |