TABLE OF CONTENTS, 



NUMBER XIII.— JULY. 



Page 



Mr.W. Hadfield's Observations on the Circumstances producing 

 Ignition in Charcoal in Atmospheric Temperatures 1 



Mr. T. Smith on the Muscular Structure and Functions of the 

 Capsule of the Crystalline Lens and Ciliary Zone 5 



Mr. T. Petherick's Experiment on the Electro-magnetism of 

 Metalliferous Veins made in a Copper Mine in Ireland .... 16 



Mr. J. Bennetts on the Electro-magnetism of Veins of Copper- 

 Ore in Cornwall 17 



P. M. on certain Experiments in Magneto-electricity and 

 Electro-magnetism 18 



Mr. B. Bevan on the Modulus of Elasticity of Gold 20 



Dr. E. Turner's Report of a Lecture on the Chemistry of Geo- 

 logy, delivered at one of the Evening Meetings at the Uni- 

 versity of London 21 



Mr. N. J. Winch's Contributions to the Geology of Northum- 

 berland and Durham 28 



Mr. H. F. Talbot on a Method of obtaining Homogeneous 

 Light of great Intensity 35 



New Books : — Rennie's Alphabet of Scientific Chemistry for 

 the Use of Beginners 35 



Proceedings of the Royal Society 37 



Geological Society 42 



Zoological Society 60 



Linnaean Society 69 



at the Friday- Evening Meetings of the Royal In- 

 stitution of Great Britain 71 



Mr. A. Trevelyan on an hitherto unobserved Property of Chlo- 

 rine — Carbonate of Potash from green and dry Plants .... 72 



Difference between Acetic and Formic Acids — On Phospho- 

 vinic Acid, and the Phosphovinates 73 



Mr. J. Holdsworth's Notice of the Discovery of Coal-Mea- 

 sures, and of Fossil Fruits, at Billesdon Coplow, in Leicester- 

 shire 76 



Cohesion of Cast Iron 79 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London ; by Mr. Giddy at Penzance, and Mr.Veallat Boston 80 



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