[ iii ] 
CONTENTS. 
(A) 
VOL. 198. 
List- of illustratioris.pf*"® ^ 
Atlvertisement.vii 
1. On the Temjicring of Iron Hardened by Overstrain. By James Muir, B.Sc , 
B.A., 'Trinity College^ Camhi-idge (1851 Exhibition Research Scholar, Glasgow 
University). Communicated lay Professor Ewing, F.R.S. .... page 1 
ri. The Measurement of Magnetic Hysteresis. By G. F, C. Searle, M.A., Peter- 
house, University Lecturer in Physics, and T. G. Bedford, M.A., Sidney 
Sussex College, Demonstrators at the Caiendisli Laboratory, Cambridge. 
Communicated, by Professor J. J. Thomson, F.R.S . 33 
III. The Measurement oj Ionic Velocities in Aqueous Solution, and the Existence oj 
Complex Ions. By B. D. Steele, B.Sc., 1851 Exhibition Scholar [Melbourne). 
Communicated by Professor PlAMSAy, F.R.S. . 105 
IV. On the Elastic Equilibrium of Circular Cylinders under Certain Practical 
Systems of Load. By L. N. G. Filon, M.A., B.Sc., Research Student of 
King’s College, Cambridge; Fellow of University College, London; 1851 
Exhibition Science Rcseai'ch Scholar. Communicctted by Professor Ewing. 
F.R.S. . 147 
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