CONTENTS 
PART II. 
III. On the connexion between Electric Current and the Electric and Magnetic 
Inductions in the surrounding Jield. By J. H. Poynting, M.A., late Felloic of 
Trinity College, Cambridge, Professor of Physics, Mason College, Birmingham. 
Communicated by Lord Rayleigh, M.A., D.C.L., F.R.S. .... page 277 
IY. On some Applications of Dynamical Principles to Physical Phenomena. By 
J. J. Thomson, M.A., F.R.S., Fellow of Trinity College, Cambridge, and 
Cavendish Professor of Experimental Physics . 307 
V. On the Constant of Magnetic Rotation of Light in Bisulphide of Carbon. By 
Lord Rayleigh, M.A., D.C.L., F.R.S. . 343 
VI. The Theory of Continuous Calculating Machines and of a Mechanism of this 
class on a Mew Principle. By Professor H. S. Hele Shaw. Communicated 
by Professor Sir William Thomson, F.R.S. . 367 
VII. On Beds of Sponge-remains in the Lower and Upper Greensand of the South of 
England. By George Jennings Hinde, Ph.D., F.G.S. Communicated by 
Henry Woodward, LL.D., F.R.S., F.G.S. . 403 
VIII. Magnetisation of Lron. By John Hopkinson, M.A., D.Sc., F.R.S. . . 455 
IX. The Absorption Spectra of the Alkaloids. By W. N. Hartley, F.R.S., Professor 
of Chemistry, Royal College of Science, Dublin . 471 
X. Experimented Researches in Magnetism. By Professor J. A. Ewing, B.Sc., 
F.R.S.E., University College, Dundee. Communicated by Sir William 
Thomson, F.R.S. . 523 
XI. Observations on the Chromatology of Actinice. By C. A. Mac Munn, M.A., 
M.D. Communicated by Professor M. Foster, Sec. R.S . 641 
