606 



IXDEX TO VOL. I. 



Electromagnetic momentum, 538 : Dynamical illus- 

 tration of. 



Electromagnetism : Ampere's laws, 193 

 Elect rotonic state, 188, 205, 538 

 Equipotential surfaces, Magnetic, 553 

 Euler, 29, :iJ. i'lS 271 



Faraday, 1.55, 188, 205, 241, 504, 629, 531, 535, 



:>li', 573,585 

 Felici. 538 

 Figures : General relation between the numbers of 



points lines and polygons in, 515; Reciprocal, 



514 



Fizeau, 500, 580 

 Fluid : Application to Lines of Force, 175; Theory 



of motion, 160; through a resisting medium, 163 

 Foramen Centrale, Sensibility to light, 242 

 Forbes, Professor, 1, 124, 142, 145, 146,243 

 Force : Diagrams of, 514 ; Lines of, 155, 158, 241 ; 



Magnetic Lines of, 551 ; Physical lines of, 451 

 Forces: Absolute values of, concerned in propagation 



of light, 588; Electromotive, 181 

 Foucault, 229, 248, 580 

 Fourier, 361 

 Frames, Equilibrium and stiffness of, 598 



Gases: Conductivity of, 403405; Division of, 

 392, 403; Dynamical Theory of, 377; Fric- 

 tion, 390 ; Ratio of specific heats of, 409 



Gauss, 81, 8890, 271 



Graham, 403 



Grassman, 125, 414, 419 



Gravitation, arising from the action of surrounding 

 medium, 571 



Green, 196 



Gregory, Dr, 126 



Gutta percha, optical properties of, 43 



Heavy body, descent of, in a resisting medium, 115 

 Helmholtz, 125, 141, 144, 145, 146, 152, 204, 243, 



271, 414,415, 488, 533 

 Herapath, 377 

 Hersshel, Sir J. F. W., 142 



Image, perfect defined, 273 

 Images, Electrical, Theory of, 209 



Induction : by motion of conductor, 540 ; Coefficients 

 of, for two circuits, 539 ; Determination of 

 coefficients of, 547 ; Electromagnetic, ~>:,r, . 

 Magnecrystallic, Theory of, 180 ; of one cur- 

 rent by another, 540 ; Paramagnetic and dia- 

 magnetic, Theory of, 178 



Instrument, perfect optical, 274 



Isinglass, optical properties of, 43, 67 



Jenkin, F., 532, 573 

 Joule, 377 . 



Kohlrausch, 492, 499, 535, 569, 579 



Lam, 30, 32, 70, 72 



Laplace, 292, 293, 294, 369 



Leslie, Sir John, 16 



Light : distinction between optical and chromatic 

 properties of, 411 ; Electromagnetic theory of, 

 502, 577 ; propagation of, forces called into 

 play, 587 ; propagation of, in a crystallised 

 medium, 583 



Liquids, Compressibility of, 50 



Listing, 271 



Magnetic field of variable intensity, 214 



Magnetic lines of force, 552 



Magnetism, Quantity and Intensity as indicated by 



lines of force, 192 



Magnets, Permanent, Theory of, 178 

 Momentum, Electromagnetic, 538 



Nasmyth, J., 57 

 Navier, 30, 31, 32, 72 

 Neumann, 208, 512, 527 



Newton, 3, 124, 135, 142, 143, 144, 145, 146, 149, 

 151, 249, 267, 410, 411, 412 



(Ersted, 30, 33, 50 



Optical Instruments, General laws of, 27 1 ; Mathe- 

 matical treatment of, 281 285 

 Oval Curves, 1 



Plate, bent by pressures, 57 

 Plateau, 243, 295 

 Platometer, New form of, 230 



