435 
Double-sixer, construction of, 219 
Dynamics, method of demonstrating 
some propositions in, 16 
Earth, figure of, 238 
»,  frictionon, ascribed toether, 422 
» inequalities of its surface, 325 
a temperature of, 354, 401 
Ebenacez, monograph on, 261 
Eclipse, solar, of Dec. 22, 1870, 204 
Electrical problems, solution of, 242 
Electro-motive machine, 197 
Ellipses, method of describing, 197 
Ellipsoid, centro-surface of, 159 
Endothelium, use of term, 340 
Equations, algebraical, 317 
55 differential, 360 
a machine for solving, 155 
oA of motion, proof of, 292 
Equations, rational, 156 
Escapement, Denison’s gravity, 283 
Ether, friction attributed to, 422 
Euripides, Phcoenisse, passage from, 
332 
Eustachian Tube, mechanism of, 321 
Bye, affected by malformation, 47, 250 
5, centre of motion of, 365 
Factorial resolution, a, 119, 125 
Figure of the earth, theory of, 238 
Flint implement exhibited, 152 
Fluid, motion of an imperfect, 220 
Function, on the rvot of any, 24 
Galileo, experiment by, 345 
» trial of, 323 
Galvanometer circuit, 374 
Geodesy, 201 
Glaciers of North Wales, 283 
Gravels, Farringdon, 99 
Greek authors, when committed to 
writing, 123 
Green Sand, lower, 130 
45 upper, 299 
Halo of 22°, 34 
Heart, effect of constant current on, 407 
Herschel’s Astronomy, 144 
Heterogeneous substances, equilibrium 
of, 427 
Hippopotamus, notes on, 299 
Homeric texts, late date of, 40 
ay tumuli, 13 
Hyperbolas, rectangular, 319 
Ice Hummocks, on some, 355, 383 
» prismatic structure in, 57 
India, Trig. survey of, 201 
Insanity, on, 263 
Instruments for sounding, 870 
Jaborandi, action of, 402 
Lanx, on a Roman, 177 
Latitude, observation for, 351 
Laws of life and rocks, 39 
Leaves, floating, theory on, 215 
Levelling, method of, 276 
Life, succession of plant, 125 
Ligamentum Teres, use of, 345 
Light, effects of, on Portland stone, 264 
Lobster, model of a, 347 
Longitude, observation for, 357 
sis of the society’s clock, 60 
Loudness, test of, 217 
Lunar distances, on a set of, 414 — 
Machine for solving equations, 155 
Mammals, spinal cord and tail of, 419 
Matter, space-theory of, 157 
Measures ‘4 bouts,” 182 
- si compared with 
“4 traits,” 251, 266 
Mechanical solution of equations, 317 
Mercury, transit of, 123 
Meteoric shower of Nov. 1866, 60 
Métres Internationaux, form of, 276 
Molluse borings in limestone, 182 
Monopolies, representation of, 318 
Moon, period of rotation, &c., 130 
Mortar, composition of, 117 
Mountains, their elevation by lateral 
pressure, 115 
Mountains, formation of, 367 
Moving bodies, resistance experienced 
by, 160 ° 
Music, Aristotle on, 375 
Musical consonance, Helmholtz and 
Tyndall on, 183 
Musical scales, modern, 64 
Narwhal, Rete mirabile of, 312 
Neolithic Age, 15 
Neutral series, 24 
Nuseirfyeh, the, 191 
Nutrition, problems of, 344 
Odysseus, Odyssey; meaning of, 295 
Optics, geometrical, 338 
Organic acids, 38 
Ornithosauria, 186 
Paganism, vitality of, 191 
Pangenesis, theory of, 285 
Papyrus of Lake Gennesaret, 8 
Peaucellier, parallel motion of, 334 
