[ iv ] 



IX. Account of Experiments on the Mexural and Torsional Rigidity of a Glass Bod, 



leading to the Determination of the Rigidity of Glass. By Joseph D. Everett, 

 B.C.L., Assistant to the Professor of Mathematics in the University of Glasgow. 

 Cmnmunicated by Professor W. Thomson, F.R.S page 185 



X. On the Laws of Connexion between the Conditions of a Chemical Change and its 



Amount. By A. Veenon Haecouet, M.A., Student of Christ Church, and De- 

 monstrator of Chemistry in the University of Oxford; and William Esson, M.A., 

 Fellow of Merton College, Oxford. Cmimunicated by Sir B. C. Brodie, Bart., 

 F.R.S. , Professor of Chemistry in the University of Oaf or d 193 



XI. On the Chameleon's Retina; a further Contribution to the Minute Anatomy of the 



Retina of Reptiles. By J. W. Hulke, F.R.C.S., Assistant Surgeon to the Middlesex 

 and Royal London Ophthalmic Hospitals. Communicated by William Bowman, 

 F.R.S. 223 



XII. On the Expansion by Heat of Water and Mercury. By A. Matthiessen, F.R.S. 231 



XIII. The Bakeeian Leotuee. — On the Viscosity or Internal Friction of Air and other 



Gases. By J. Cleek Maxwell, M.A., F.R.S. 249 



XIV. Researches on Gun-cotton. — On the Manufacture and Composition of Gun-cotton. 



By F. A. Abel, F.R.S., V.P.C.S. 269 



XV. Researches on Acids of the Lactic Series. — No. I. Synthesis of Adds of the Lactic 



Series. By E. Frankland, F.R.S., Professor of Chemistry in the Royal Institu- 

 tion of Great Britain and in the Government School of Mines; and B. F. 

 Duppa, Esq 309 



XVI. Fundamental Views regarding Mechanics. By Dr. J. Plucker, of Bonn, For. 



Meml. R.S. . 361 



XVII. Further Observations cm the Spectra of some of the Nebulae, with a Mode of deter- 

 mining the Brightness of these Bodies. By William Huggins, F.R.S. . 381 



XVIII. On the Absorption and Dialytic Separation of Gases by Colloid Septa, By 

 Thomas Graram, F.R.S., Master of the Mint 399 



XIX. Results of the Magnetic Observations at the Kew Observatory. — No. III. By 



Lieut-General Edward Sabine, R.A., President of the Royal Society . . 441 



XX. Contributions to Terrestrial Magnetism. — No. X. By Lieut.- General Edwaed 



Skbin^, R. A., President of the Royal Society 453 



XXI. On the Anatomy and Physiology of the Nematoids, Parasitic and Free ; with 

 observations on their Zoological Position and Affinities to the Echinoderms. By 

 H. Chaelton Bastian, M.A., M.B. Lond., F.L.S 645 



