ir CONTENTS. 



Page 

 Metals; with the Description of a new and convenient Ap- 

 paratus for experimenting with 85 



Mr.W. G. Horner on the Signs of the Trigonometrical Lines 86 



Rev. P. Keith on the Structure of Animals {concluded) 90 



Prof. T. Everitt on the Reaction which takes place when Ferro- 

 cyanuret of Potassium is distilled with dilute Sulphuric Acid ; 

 with some Facts relative to Hydrocyanic Acid and its pre- 

 paration of uniform strength 97 



Prof. W. H. Miller on the Forms of Sulphuret of Nickel and 



other Substances 104? 



Rev. Baden Powell's Abstract of the essential Principles of 

 M. Cauchy's View of the Undulatory Theory, leading to an 

 Explanation of the Dispersion of Light; with Remarks 



{continued) IO7 



Mr. R. H. Brett and Mr. G. Bird on the Existence of Titanic 



Acid in Hessian Crucibles 113 



Mr. J. W. Lubbock on some Elementary Applications of Abel's 



Theorem 116 



Dr. Faraday's Experimental Researches in Electricity. — 



Eighth Series {continued) , 125 



Sir David Brewster's Notice of the Optical Properties of a new 



Mineral supposed to be a Variety of Cymophane 133 



Prof. J. D. Forbes on the Refraction and Polarization of Heat 134? 



Proceedings of the Royal Society 14-2 



Geological Society 146 



■ Zoological Society 150 



Royal Geological Society of Cornwall 153 



Cobalt Blue Colours 156 



M. C. Matteucci on the Influence of Electricity in Germina- 

 tion 157 



Mr. H. A. Meeson on the Detection of Opium ; and on a new 



Test for Morphia and Quina J58 



Fall of a Meteorite in Moravia 1.59 



Meteorological Observations 160 



NUMBER XXXIll.— MARCH. 



Sir David Brewster's Observations on the supposed Acliroma- 

 tism of the Eye ^ jgj 



Dr. H. Johnson on the General Existence of a newly observed 

 and peculiar Property in Plants, and on its Analogy to the 

 Irritability of Animals I54 



Mr. E.M. Clarke on a new Phaenomenon in Magneto- Electri- 

 city 159 



Mr. J. Thomson's Note relative to the Form of the Fibres of 

 Cotton 2 "70 



