CONTENTS OF VOL. XXII, 



(FOURTH SERIES.) 



NUMBER CXLIV.— JULY 1861. 



Page 



Prof. Magnus on the Propagation of Heat in Gases. (With a 



Plate.) 1 



The Astronomer Royal on a supposed Failure of the Calculus 



of Variations 12 



Mr. T. S. Hunt on the Theory of Types in Chemistry 15 



Prof. W. Thomson on the Reduction of Observations of Under- 

 ground Temperature ; with Application to Professor Forbes's 

 Edinburgh Observations, and the continued Cal ton Hill Series. 23 

 Mr. F. Galton on Meteorological Charts. (With a Plate.) . . 34 

 Mr. A. Cayley on the Curves situate on a Surface of the Second 



Order 35 



Prof. Rood on some Experiments connected with Dove's Theory 



of Lustre 38 



Prof. Sylvester on Tactic 45 



Dr. Atkinson's Chemical Notices from Foreign Journals 55 



Mr. J. S. Glennie on the Principles of Energetics. — Part II. 



Molecular Mechanics 62 



Proceedings of the Royal Society : — 



Dr. Frankland and B. Duppa on Boric Ethide 64 



Dr. Simpson on Cyanide of Ethylene and Succinic Acid. . 66 

 Prof. Matteucci on the Electric Function of the Torpedo. . 68 

 Dr. Hofmann on the History of Azobenzol and Benzidine. 70 

 Mr. E. T. Mills on Bromphenylamine and Chlorphenyl- 



amine 73 



Mr. P. Griess on New Compounds produced by the sub- 

 stitution of Nitrogen for Hydrogen 75 



Proceedings of the Geological Society : — 



Mr. M. W. T. Scott on the * Symon Fault' in the Coal- 

 brook Dale Coal-field 77 



Mr. J. Prestwich on the Occurrence of Cyrena fluminalis 



above the Boulder Clay at Kelsey Hill near Hull 78 



On the Solidification of certain Substances, by M. L. Dufour. . 79 

 On the Changes produced in the position of the Fixed Lines in 

 the Spectrum of Hyponitric Acid by changes in Density, by 

 M. Weiss 80 



NUMBER CXLV.— AUGUST. 



Prof. Chapman on the Klaprothine or Lazulite of North Caro- 

 lina 81 



Prof. Magnus on the Propagation of Heat in Gases 85 



