CONTENTS. 

 VOL. XIX. 



No. 123.— June 16, 1870. 



Page 



On the Atmospheric Lines of the Solar Spectrum, in a Letter to the Presi- 

 dent. By Lieut. J. H. Hennessey 1 



On the Eadiation of Heat from the Moon. — No. II. By the Earl of Rosse, 

 F.R.S 9 



On Linear Differential Equations.— No. in. By W. H. L. Russell, F.RS. 14 



Observations with the Great Melbourne Telescope, in a Letter to Prof. 

 Stokes. By A. Le Sueur 18 



Chemical and Physiological Experiments on living Cinchonse. By J. 

 Broughton, B.Sc, F.C.S., Chemist to the Cinchona-Plantations of the 

 Madras Government 20 



Researches on the Hydrocarbons of the Series C» H271.+2. — VI. By C. 

 Schorlemmer 20 



Formation of Cetyl-alcohol by a singular reaction. By C. Schorlemmer . 22 



Researches in Animal Electricity. By C. B. Radcliffe, M.D. ............ 22 



List of Presents «....- 29 



Communications received after the Session. 

 On Approach caused by Vibration. By Frederick Guthrie 35 



On Jacobi's Theorem respecting the relative equilibrium of a Revolving 

 Ellipsoid of Fluid, and on Ivory's discussion of the Theorem. By I. 

 Todhunter, M. A., F.R.S., late Fellow of St. John's College, Cambridge . . 42 



On the Theory of Continuous Beams. By John Mortimer Heppel, M. Inst. 

 C.E 56 



Remarks on Mr. Heppel's Theory of Continuous Beams. By W. J. Macquorn 

 Rankine, C.E., LL.D., F.R.S 68 



Researches into the Chemical Constitution of the Opium Bases. — Part IV. 

 On the Action of Chloride of Zinc on Codeia. By Augustus Matthiessen, 

 F.R.S., Lecturer on Chemistry at St. Bartholomew's Hospital, and W. 

 Burnside, of Christ's Hospital 71 



