Jy CONTENTS. 



Page 



On the Manganeseous and Manganesic Acids. By Dr. G. Forrhammer. 130 



On the Mathematical Principles of Chemical Philosophy. By Mr.Emmett 137 



Proceedings of the Royal Society, June 29 145 



Geological Society, June 16 14? 



Fibrous Zeolite 1^8 



Aereolite ' • • '"^S 



Curious Atmospherical Phenomenon 149 



Compressibility of Water ^'^9 



■ Pure Potash. By Dr. Prout 150 



Urine of the Horse. By Dr. Prout 150 



Fluid of Hydrocephalus. By Dr. Prout 151 



Education in France 151 



Method of preserving Currants fresh till January or February 152 



Meteorological Journal made at Cork. By T. Holt, Esq. (With a Plate.) 152 



New Scientific Books 1.54 



New Patents 155 



Col. Beaufoy's Magnetical and Meteorological Observations for June 156 



Mr. Howard's Meteorological Journal for June 159 



NUMBER XCUI.— SEPTEMBER. 



On the Specific Gravity of Gases. By Thomas Thomson, M.D. F.R.S. . 161 



On Rain-Gauges. By Mr. H. Boase. (With a Plate.) I77 



On the Mathematical Principles of Chemical Philosophy. By Mr. Em- 



mett {rontinued) 180 



On the Theory of Arbogast. By Mr. Harvey 188 



On Mesotype, Needlestone, and Thomsoniie. By H. J. Brooke, Esq. .. 193 



On the Atomic Theory. By Dr. Macneven I95 



On Wodan-Pyrites. By Mr. Stromeyer 214 



On the Evaporation of Spirits. By Mr. William Ritchie 215 



On Fcrrochyazate of Iron. Ry Thomas Thomson, M.D. F.R.S 2l6 



Removal of Accumulations which impede Navigation. By Dr. M'Sweeny 224 



Proceedings of the Linnaean Society, June 6, and 30 225 



Singular Rain 226 



Muriate of Potash in Rock Salt 226 



Benzoic Acid £27 



Self-registering Rain-Gauge 228 



Mr- Thomason's Metallic Vase 229 



Naturalization of tender Exotics. Ry Mr. Murray 230 



Uniformity of Insular Climate. By the Same 23 1 



Vegetation of Bulbous Roots in Water. By the Same 23 1 



Oxidation by Solar Light. By the Same 232 



Lute. By the Same 232 



Solubililv of Phosphorus in Water. By the Same 232 



