CONTENTS OF VOL. XV. 



NUMBER XCIII.— JULY, 1839. Page 



Prof. Miller's Note on the Velocity of Sound 1 



Mr. T. Richardson's Notices in Analytical Chemistry 2 



Mr, Ivory's Bakerian Lecture on the Theory of the Astrono- 

 mical Refractions 3 



Col. R. "Wright's Meteorological Observations during a Resi- 

 dence in Colombia between the Years 1820 and 1830 13 



Dr. Bowring on the Boracic Acid Lagoons of Tuscany 21 



Prof. Forbes on the Colours of the Atmosphere considered with 

 reference to a previous Paper " On the Colour of Steam un- 

 der certain circumstances" 25 



Mr. F. W. MuUins's Observations on an improved Construction 



of the Voltaic sustaining Battery 37 



Prof, J, Thomson's Geometrical Proposition 41 



Dr. T, Thomson on Pyroxylic Spirit and its Compounds .... 42 

 Dr. Schweitzer's Analysis of Sea- water as it exists in the En- 

 glish Channel near Brighton 51 



Mr. H. K. G. Morgan on the Use of the Galvanic Battery in 



Blasting 60 



Mr. G, Fownes on the Equivalent of Carbon . .^ 62 



Prof. C. Kersten and Prof. Ehrenberg on a Leather-like Sub- 

 stance found formed upon a Meadow 65 



New Books : — Dr, Thomson's Chemistry of Organic Bodies : 



Vegetables : — Plateau's Memoire sur 1' Irradiation 67 



Proceedings of the Linnsean Society 70 



of the Royal Institution 75 



New Experimental Researches on Caoutchouc, by Dr. A, 



Ure 76 



On the Preparation of Fulminic Acid, by M. Fehling 77 



Birth of a Giraffe at the Garden of the Zoological Society. ... 79 



Meteorological Observations for May 1839 79 



Meteorological Observations made at the Apartments of the 

 Royal Society by the Assistant Secretary, Mr. Roberton ; 

 by Mr. Thompson at the Garden of the Horticultural Society 

 at Chiswick, near London; by Mr. Veall at Boston; and by 

 Mr. Dunbar at Applegarth Manse, Dumfries-shire 80 



NUMBER XCIV.— AUGUST. 



Mr. Grove on the Inaction of Amalgamated Zinc in acidulated 

 Water 81 



Mr. Halliwell's Notice of a lost Manuscript of the Seventh Book 

 of the Mathematical Collections of Pappus Alexandrinus. ... 85 



Mr. T. Richardson's Note of an Analysis of Colophonite .... 86 



a 2 



