Vi CONTENTS. 



Page 



Dr. Von Galen's Communication respecting the Comet of Short Period dis- 

 covered by Brorsen, Feb. 26, 184G, and its reappearance in 1851 23 



Mr. E.J. Lowe's Observations made at the Observatory of Highfield House on 



Zodiacal Light 24 



Dr. John Tyndall on Air-bubbles formed in Water 26 



Rev. W. Whewell on our Ignorance of the Tides 27 



Meteorology. 



Dr. Andrews's Account of an Apparatus for determining the Quantity of Hy- 



grometric Moisture in the Air 29 



Dr. Buist's Sketch of the Climate of Western India 29 



on Hail-storms in India, from June 1850 to May 1851 31 



Dr. John Lee on the Alten and Christiania Meteorological Observations 33 



Mr. E. J. Lowe on some Unusual Phaenomena 33 



Mr. Robert Russell's Observations on Storms 34 



Mr. Henry Twining on some of the Appearances which are peculiar to Sun- 

 beams 35 



Rev.T. Rankin's Register of Meteorological Phaenomena at Huggate in York- 

 shire 36 



Lieut.-Col. W. Reid's Law of Storms. — On Mooring Ships in Revolving Gales 36 

 Mr. John C. Pyle's Abstract of Meteorological Observations made at Fut- 



tegurh, for the Year 1850, North-west Provinces, Bengal 39 



Mr. J. K. Watts's Notice of Aurora Borealis seen at St. Ives, Hunts, Oct. 1, 



1850 41 



— — Notice of a Snow-Storm 41 



Account of a Lunar Rainbow, seen Aug. 23, 1850, between 



Haddenham and Earith, near St. Ives 41 



Mr. W. H. Webster on the Rise and Fall of the Barometer 42 



Mr. John Welsh's Description of a Sliding Rule for Hygrometrical Cal- 

 culations 42 



CHEMISTRY. 



Dr. T.Anderson on the Products of the Action of Heat on Animal Substances 43 



Dr. Beke on a Diamond Slab supposed to have been cut from the Koh-i-Noor 44 



M.Boutigny on the Cause which maintains Bodies in the spheroidal state be- 

 yond the sphere of Physico-chemical Activity 44 



Mr. A. Claudet on the Dangers of the Mercurial Vapours in the Daguerreo- 

 type Process, and the means to obviate the same 44 



on the Use of a Polygon to ascertain the Intensity of the 



Light at different Angles in the Photographic Room 45 



Mr. J. B. Lawes and Dr. J. H. Gilbert on Agricultural Chemistry, especially 

 in relation to the Mineral Theory of Baron Liebig 45 



Professor Thomas Graham on Liquid Diffusion , 47 



Professor W. R. Johnson on some Theoretical and Practical Methods of de- 

 termining the Calorific Efficiencies of Coals 47 



Mr. Mercer on a new Method of contracting the Fibres of Calico, and of ob- 

 taining on the Calico thus prepared Colours of much brilliancy 51 



Professor E. A. Scharling on the Action of Superheated Steam upon Organic 

 Bodies 51 



