CONTENTS of N° 228.— Fourth Series. 



XL Experimental Researches in Magnetism and Electricity. By 

 H. Wilde, Esq. (With a Plate.) page 81 



XII. On an Apparatus for the Detection of Adulterations in Coffee. 

 By John C. Draper, M.D., Professor of Natural History, College of 

 the City of New York, and of Analytical Chemistry in the University 



of New York 104 



XIII. The Conic Theory of Heat, in connexion chiefly with the 

 Metamorphosis of Matter. By the Rev. J. B. Harbord, M.A 106 



XIV. On Negative Fluorescence and Phosphorescence. By Pro- 

 fessor C. Bohn 108 



XV. Remarks on the Change in the Obliquity of the Ecliptic, and 



its Influence on Climate. By James Croll 127 



XVI. Remarks on Sir Benjamin Brodie's System of Chemical No- 

 tation. By Alexander Crtjm Brown, M.D., D.Sc 129 



XVII. On the so-called "Inactive" Condition of Solids. By 

 Charles Tomlinson, F.R.S.. 136 



XVIII. On the Moon's Influence over Cloud. By J. Park Har- 

 rison, M.A 143 



XIX. Proceedings of Learned Societies : — 



Royal Society: — Mr. H. C. Sorby on a Definite Method of 

 Qualitative Analysis of Animal and Vegetable Colouring-mat- 

 ters by means of the Spectrum Microscope 144 



XX. Intelligence and Miscellaneous Articles : — 



Some Observations on Glass Tears, by E. Reusch 166 



Experiments on the Magnetism and Diamagnetism of Gases, by 

 M. J. Chautard 168 



',* It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



