IV CONTENTS. 



Page 

 Mr. W. Thompson's Comparison of the Rain which fell at Florence Court, the 



seat of the Earl of Enniskillen, from July 6th, 1843, to July 6th, 1844, with 



that which fell at Belfast during the same period 14 



On the Orthochronograph, invented by the late Mr. Lowman ". 14 



Mr. Luke Howard on the Mean Year, or Solar Variation through the Seasons 



of the Barometer in the Climate of London 14 



Professor Phillips on the Quantities of Rain received in Gauges at unequal 



Elevations upon the Ground 21 



on Simultaneous Barometrical Registration in the North of 



England 21 



■ on the Curves of Annual Temperature at York 21 



Mr. T. Hopkins on the Irregular Movements of the Barometer 21 



on the Diurnal Variations of the Barometer 22 



Sergeant Mayer's Year's Meteorological Observations made at Aden 22 



Rev. T. Rankin on the Temperature of the Air at various Soundings of Huggate 



Well, upon the Wolds of the East Riding, Yorkshire 22 



■ ■■ on a singular Appearance of a Thunder Storm on Yorkshire 



Wolds, July 5, 1843 23 



Mr. James Thomas Goddard's Description of an improved Anemometer 23 



Lieut. -Col. Everest on an Instrument called a Barometer Pump, for filling 



Barometer Tubes in vacuo 24 



Professor J. D. Forbes's Account of an Attempt to establish the Plastic Nature 



of Glacier Ice by direct Experiment 24 



Mr. Eaton Hodgkinson's Experimental Inquiries into the Falling-off from 



perfect Elasticity in Solid Bodies 25 



Communications from Norway, presented by Mr. John Lee 27 



CHEMISTRY. 



Mr. W. West on the Mineral Springs and other Waters of Yorkshire 28 



Professor Daubeny's Account of the Phosphorite Rock in Spanish Estremadura 28 

 Mr. J. C. BowRiNG on the Theory and Practice of Amalgamation of Silver Ores 



in Mexico and Peru ^ 28 



Mr. Joseph Bateman on Mr. Phillips's Method of discovering Adulteration in 



Tobacco 29 



Mr. W. Lucas on the Limestones of Yorkshire 30 



Mr. Edward Schunck on some Products of the Decomposition of Erythrin ... 31 



Mr. John Mercer's Note on the Solvent Power of Solutions of Acetates 32 



Mr. Robert Warington on Guano 32 



Drs. Smith and Leigh on the Action of Nitric Acid on Naphtha 33 



Dr. J. S. MusPRATT on the supposed Formation of Valerianic Acid from Indigo, 

 and on the Acid which is formed by the Action of Hydrate of Potash upon 



Lycopodium 33 



Mr. Robert Rigg's Experiments on the Formation or Secretion of Carbon by 

 Animals, the Disappearance of Hydrogen and Oxygen, and the Generation of 



Animal Heat during the process 33 



Mr. C. J. Jordan on increasing the Intensity of the Oxyhydrogen Flame 33 



Mr. J. P. Joule on Specific Heat 34 



Mr. W. West's Account of Experiments on Heating by Steam 35 



Dr. Thomas Tilley on a peculiar Condition of Zinc, produced by a long-con- 

 tinued High Temperature 35 



Mr. T. M. Greenhow's Description of an Air- Duct to be used in Glass Furnaces 



for the Prevention of Smoke, with Models 35 



Mr. Robert Hunt on the Influence of Light on Chemical Compounds, and 



Electro-Chemical Action 35 



on the Ferrotype, and the Property of Sulphate of Iron in 



developing Photographic Images 36 



Mr. Thomas Woods on the Electrolysotype ; a new Photographic Process ... 36 



Professor Grove on Photography 37 



