CONTENTS. 

 VOL. XL VII. 



No. 286.— December 5, 1889. 



Page 



.Remarks on Mr. A. W. Ward's Paper " On the Magnetic Rotation of the 

 Plane of Polarisation of Light in doubly refracting Bodies." By O. 

 Wiener and W. Wedding, Physikalisches Institut, Strassburg i. E 1 



Researches on the Chemistry of the Camphoric Acids. By J. E. Marsh, 

 B.A., Demonstrator of Organic Chemistry at the University Labora- 

 tory, Oxford 6 



The Influence of Stress and Strain on the Physical Properties of Matter. 

 Part III. Magnetic Induction {continued). The Internal Friction of 

 Iron, Nickel, and Cobalt, studied by means of Magnetic Cycles of very 

 minute Range. By Herbert Tomlinson, B.A., F.R.S 13 



A Compound Wedge Photometer. By E. J. Spitta, L.R.C. Phys. Lond. 15 



List of Presents ■. 18 



December 12, 1889. 



The Relation of Physiological Action to Atomic Weight. By Miss H. J. 

 Johnstone, University College, Dundee, and Thos. Carnelley, Pro- 

 fessor of Chemistry in the University of Aberdeen 21 



An experimental Investigation into the Arrangement of the excitable 

 Fibres of the Internal Capsule of the Bonnet Monkey (Macacus 

 sinicus). By Charles E. Beevor, M.D., F.R.C.P., and Victor Horsley, 

 B.S., F.R.S. (from the Laboratory of the Brown Institution) 21 



On the Effect of the Spectrum on the Haloid Salts of Silver. By Captain 

 W. de W. Abney, C.B., R.E., D.C.L., F.R.S., and G. S. Edwards, C.E. 22 



Magnetic Properties of Alloys of Nickel and Iron. By J. Hopkinson, 

 F.R.S , 23 



List of Presents 25 



December 19, 1889. 



Comparison of the Spectra of Nebula? and Stars of Groups I and II with 

 those of Comets and Aurorge. By J. Norman Lockyer, F.R.S 28 



The Presence of Bright Carbon Flutings in the Spectra of Celestial 

 Bodies. By J. Norman Lockyer, F.R.S 39 



