CONTENTS OF VOL. X. 



NUMBER LVIII.— JANUARY, 1837. 



Page 



Mr. Charlesworth's Observations on the Crag, and on the 

 Fallacies involved in the present System of Classification of 

 Tertiary Deposits 1 



Mr. N. S. Heineken's Description of an Anchor found at 

 Seaton, Devonshire 10 



Mr. F. W. Mullins on a Mode of obtaining increased Power 

 from Magneto-electric Machines ; in reply to the Rev. W. 

 Ritchie 12 



Dr. Boase's Additional Remarks on Mr. Hopkins's *' Re- 

 searches in Physical Geology" 14 



Prof. J. Thomson on the true and extended Interpretation of 

 Formulae in Spherical Trigonometry ^ 18 



Demonstrations of certain Points in Fresnel's Theory of Double 

 Refraction, deduced from the Investigations of the Undula- 

 tory Theory which have recently appeared in this Journal 24? 



Rev. R. Murphy on a new Theorem in Analysis 28 



On the Property of the Parabola demonstrated by Mr. Lubbock 

 in the Phil. Mag. for August 32 



Rev. H. Holditch'a Concise Demonstration of the Property of 

 the Parabola in the Phil, Mag. for August 35 



Rev. P. Keith on the Classification of Vegetables 37 



Mr. MacCullagh on the Laws of Crystalline Reflexion 42 



Dr. R. J. Kane's Researches in Organic Chemistry, First Series. 

 — Contributions to the History of Pyroxylic Spirit and of its 

 derived Combinations 45 



Dr. M. Hall on Professor Miiller's Account of the Reflex 

 Function of the Spinal Marrow 51 



Rev. W. Ritchie's Reply to Mr. Rainey's Communication in 

 the Phil. Mag. for December 1836 57 



Rev. W. Ritchie's Remarks on two of the Electric and Mag- 

 netic Communications in Phil. Mag. for December 1836 . . 60 



Proceedings of the Royal Society 62 



Geological Society 68 



Linnaean Society 71 



On the Construction of Oblique Bridges 74? 



Observations on the Aurora Borealis 75 



Process of making crystallized Sugar from Toddy, or the Juice 

 of the Cocoa-nut Palm, on the Island of Ceylon 77 



Prof. Renwick on the Height of the Rocky Mountains of North 

 America 78 



Meteorological Observations made at the Apartments of the 

 Royal Society by the Assistant Secretary j by Mr. Thomp- 

 son at the Gardens of the Horticultural Society at Chiswick, 



near London; and by Mr. Veall at Boston 79 



a 2 



