CONTENTS. 

 VOL. XI. 



Anniversary Meeting Address of the President 1 



On Coal-Gas. By the Rev. W. R. Bowditch 25 



On the Gyroscope. By Arthur Hill Curtis, Esq 40 



On an Extension of Arbogast's Method of Derivations. By Arthur 

 Cayley, Esq., F.R.S 42 



On the Method of Symmetric Products, and on certain Circular 

 Functions connected with that Method. By the Rev. Robert 

 Harley 43 



On the. Surface-condensation of Steam. By J. P. Joule, LL.D., F.R.S. 44 



Notice of Recent Scientific Researches carried on Abroad. By the 

 Foreign Secretary 45 



Notice of Recent Scientific Researches carried on Abroad. By the 

 Foreign Secretary 53 



On the Chemical Constitution of Narcotine and of its Products of 

 Decomposition. By A. Matthiessen, Esq., and George C. Foster, 

 Esq 55 



Researches on the Arsenic-Bases. By A. W. Hofmann, LL.D., F.R.S. 62 



Contributions towards the History of the Monamines. No. IV. 

 Separation of the Ethyl-Bases. By A. W. Hofmann, LL.D., F.R.S. 66 



On the Equation for the Product of the Differences of all but one of 

 the Roots of a given Equation. By Arthur Cayley, Esq., F.R.S. 69 



Description of a new Optical Instrument called the " Stereotrope." 

 By William Thomas Shaw, Esq 70 



On the Lunar-Diurnal Variation of the Magnetic Declination obtained 

 from the Kew Photograms in the years 1858, 1859, and 1860. By 

 Major-General Edward Sabine, R.A., Treas. and V.P.R.S 73 



On the Homologies of the Eye and of its Parts in the Invertebrata. 

 By J. Braxton Hicks, M.D 81 



On the Calculus of Symbols, with Applications to the Theory of Dif- 

 ferential Equations. By W. H. L. Russell, A.B 84 



On the Properties of Liquid Carbonic Acid. By George Gore, Esq. 85 



On Systems of Linear Indeterminate Equations and Congruences. 

 By H. J.Stephen Smith, M.A 87 



Contributions to the Physiology of the Liver. Influence of Alkalies. 

 By Frederick W. Pavy, M.D. 90 



