xvii 
XVII. Problems in Electric Convection. By G. F. C. Searle, M.A., of Peterhouse, 
Cambridge, Demonstrator in Experimented Physics in the University of 
Cambridge. Communicated by Professor J. J. Thomson, F.R.S. . page 675 
XVIII. The Hysteresis of Iron and Steel in a Rotating Magnetic Field. By 
Francis Gibson Baily, M.A., Professor of Electrical Engineering, Heriot- 
Watt College, Edinburgh. Communicated by Professor 0. Lodge, 
F.R.S. .715 
Index to Volume 
747 
