CONTENTS. 



VOL. XXXV. 



No. 224.— February 1, 1883. 



Page 



On the Electrical Eesistance of Carbon Contacts. By Shelford Bidwell, 

 M.A., LL.B 1 



On the Affinities of Thylacoleo. By Professor Owen, C.B., F.K.S., &c 19 



Preliminary Note on a Theory of Magnetism based upon New Experi- 

 mental Researches. By Professor D. E. Hughes, F.R.S 19 



February 8, 1883. 



Note on Terrestrial Radiation. By John Tyndall, F.R.S 21 



February 15, 1883. 



Some Experiments on Metallic Reflection. III. On the Amount of 

 Light Reflected by Metallic Surfaces. By Sir John Conroy, Bart., 

 M.A 26 



Description of an Apparatus employed at the Kew Observatory, Rich- 

 mond, for the Examination of the Dark Glasses and Mirrors of 

 Sextants. By G. M. Whipple, B.Sc, Superintendent 42 



On the Atomic Weight of Manganese. By James Dewar, M.A., F.R.S., 

 Jacksonian Professor, Cambridge, and Alexander Scott, M.A 44 



February 22, 1883. 



The Effects of Temperature on the Electromotive Force and Resistance 

 of Batteries. By William Henry Preece, F.R.S 48 



Preliminary Note on the Action of Calcium, Barium, and Potassium on 

 Muscle. By T. Lauder Brunton, M.D., F.R.S., and Theodore Cash, 

 M.D , 63 



On the Formation of Uric Acid in the Animal Economy and its relation 

 to Hippuric Acid. ' By Alfred Baring Garrod, M.D., F.R.S 63 



