viii CONTENTS 16. ON THE EQUILIBRIUM OF FLOATING ELASTIC PLATES, 1884 17. ON THE RELATIONS BETWEEN MAXWELL'S FUNDAMENTAL ELECTRO- MAGNETIC EQUATIONS AND THE FUNDAMENTAL EQUATIONS OF THE OPPOSING ELECTROMAGNETICS, 1884. PAGE 266 273 18. ON THE DIMENSIONS OF MAGNETIC POLE IN DIFFERENT SYSTEMS OF UNITS, 1885. 291 19. A GRAPHICAL METHOD OF DETERMINING THE ADIABATIC CHANGES OF MOIST AIR, 1884 · 20. ON THE RELATIONS BETWEEN LIGHT AND ELECTRICITY, 1889 21. ON THE PASSAGE OF CATHODE RAYS THROUGH THIN METALLIC 296 · · 313 LAYERS, 1892 22. HERMANN VON HELMHOLTZ, 1891 · 328 332