CONTENTS. 



VOL. XXXIII. 



— •• iHi *' — 



No. 216 .— November 17, 1881. 



Page 



Preliminary Notes on the Photographic Spectrum of Comet b 1881. By 

 William Huggins, D.C.L., LL.D., F.E.S. (Plate 1) 1 



Note on the Reversal of the Spectrum of Cyanogen. By G. D. Liveing, 

 M.A., F.R.S., Professor of Chemistry, and J. Dewar, M.A., F.R.S., 

 Jacksonian Professor, University of Cambridge 3 



The Sums of the Series of the Reciprocals of the Prime Numbers and of 

 their Powers. By C. W. Merrifield, F.R.S 4 



Further Note on the Minute Anatomy of the Thymus. By Herbert 

 Watney, M.A., M.D. Cantab 11 



Experimental Researches on the Propagation of Heat by Conduction in 

 Bone, Brain-tissue, and Skin. By J. S. Lombard, M.D., formerly 

 Assistant Professor of Physiology in Harvard University 11 



On the Comparative Structure of the Brain in Rodents. By W. Bevan 

 Lewis, L.R.C.P. (Lond.), Senior Assistant Medical Officer to the West 

 Riding Asylum, Wakefield 15 



On the Production of Transient Electric Currents in Iron and Steel Con- 

 ductors by Twisting them when Magnetised or by Magnetising them 

 when Twisted. By J. A. Ewing, B.Sc, F.R.S.E., Professor of Mecha- 

 nical Engineering in the University of Tokio, Japan 21 



The Prehensores of Male Butterflies of the Genera Oruithoptera and 

 Papilio. By Philip Henry Gosse, F.RS 23 



On the Propagation of Inhibitory Excitation in the Medulla Oblongata. 

 By Dr. H. Kronecker and Mr. S. Meltzer, Candidate in Medicine, 

 Berlin 27 



On the Refraction of Plane Polarised Light at the Surface of a Uniaxal 

 Crystal. By R. T. Glazebrook, M.A., Fellow and Assistant Lecturer 

 of Trinity College, Demonstrator in the Cavendish Laboratory, Cam- 

 bridge 30 



On Allotropic or Active Nitrogen and on the Complete Synthesis of Am- 

 monia. By George Stillingfleet Johnson, King's College 32 



