CONTENTS. 



VOL. XXXII. 



No. 212.— March 24, 1881. 



Page 



The Croonian Lecture. — Observations on the Locomotor System of 

 Echinodermata. By George J. Eomanes, M.A., F.E.S., and Professor 

 James C. Ewart, M.D 1 



The Functional Belations of the Motor Eoots of the Brachial and Lumbo- 

 sacral Plexuses. By David Ferrier, M.D., F.B.S., Professor of 

 Forensic Medicine, and Gerald F. Yeo, M.D., F.E.C.S., Professor of 

 Physiology in King's College 12 



On the Histology and Physiology of the Pepsin-formiug Glands.. By J. 

 N. Langley, M.A., Fellow of Trinity College, Cambridge 20 



March 31, 1881. 



On the Coefficients of Expansion of the Di-iodide of Lead, Pbl 2 , and of 

 an Alloy of Iodide of Lead with Iodide of Silver, PbI 2 AgI. By G. F. 

 Eodwell, F.E.A.S., F.C.S., Science Master in Marlborough College .... 23 



Permanent Molecular Torsion of Conducting Wires produced by the 

 Passage of an Electric Current. By Professor D. E. Hughes, F.E.S 25 



On the Tendinous Intersection of the Digastric. By G. E. Dobson, 

 M.A., M.B 29 



Note on Protagon. By Henry E. Eoscoe, LL.D., F.E.S 35 



April 7, 1881. 



On the Minute Structure of the Lung of the Newt with especial reference 

 to its Nervous Apparatus. By William Stirling, M.D., Sc.D., Eegius 

 Professor of the Institutes of Medicine (Physiology) in the University 

 of Aberdeen 37 



On an Electrodynamic Balance. By H. Helmholtz, For. Mem. E.S., 

 Professor of Physics in the University of Berlin 39 



