CONTENTS. 
PART II. 
XIII. On the Dynamics of a Rigid Body in Elliptic Space. By R. S. Heath, B.A., 
Fellow of Trinity College, Cambridge. Communicated by Professor Cayley, 
Scidlerian Professor of Mathematics in the University of Cambridge . page 281 
XIY. Researches on Spectrum Photography in relation to New Methods of Quantitative 
Chemical Analysis. — Part II. By W. N. Hartley, F.R.S.E., &c., Professor 
of Chemistry, Royal College of Science, Dublin. Communicated by Professor 
Stokes, Sec. P.S. . 325 
XV. On the Transfer of Energy in the Electromagnetic Field. By J. H. Poynting, 
M.A., late Felloiu of Trinity College, Cambridge, Professor of Physics, Mason 
College, Birmingham. Communicated by Lord Rayleigh, M.A., D.C.L., 
F.P.S. . 343 
XYI. On the Motion of Fluid, part of which is moving Rotationally and part Irrota- 
tionally. By M. J. M. Hill, M.A., Professor of Mathematics at the Mason 
Science College, Birmingham. Communicated by Professor Stokes, D.C.L., 
Sec. P.S . 363 
XYII. On the Electro-chemical Equivalent of Silver, and on the Absolute Electromotive 
Force of Clark Cells. By Lord Rayleigh, D.C.L., F.P.S., and Mrs. H. 
Sidgwick.411 
XYIII. Influence of Ch ange of Condition from the Liquid to the Solid State on Vapour- 
Pressure. By William Ramsay, Ph.D., Professor, and Sydney Young. D.Sc., 
Lecturer and Demonstrator of Chemistry in University College, Bristol. Com¬ 
municated by Professor James Thomson, LL.D., F.R.S. . 461 
