„ gaseous state, second condition of, 24 „ „ globular, 21 „ heat of, not due to gravitation, 27 „ how they occupy so much space, 18 „ how origin of by impact might not have been observed, 110 „ must possess an excessive temperature, 26 „ Mr. Lockyer on, 20-22 „ origin of, 18 „ Prof. A. Winchell on meteoric origin of, 22 „ Prof. Tait on, 20 „ Sir W. Thomson on origin of, 6, 28 „ spheroidal, 22 „ why of such various shapes, 19 Nebular hypothesis, gaseous condition essential to, 2, 5 Newcomb, Prof., on motion of 1830 Groombridge, 15 Newlands on Periodic Law, 96 Nova Cygni, on sudden outburst of, 33 Objection considered, 109 Palæozoic times, winds probably not higher than at present, 46 Peach, Mr. B. N., on examples of enormous faults, 55 „ on denudation of the south of Scotland, 55 Periodic Law, argument from, 96 „ Prof. Mendelejeff on 96 Periodic Law, Newlands on, 96 „ Prof. Reynolds on, 96 Planets, on their arrangement according to density, 25 Polymerisation, argument from, 95 „ Dr. Mills on, 95 Pouillet, on rate of solar radiation, 2, 35 Powell, Major J. W., on denudation of Uinta Mountains, 58 Pre-nebular condition of matter, Dr. G. Johnstone Stoney on, 99 „ condition of matter, Dr. T. Sterry Hunt on, 85 „ condition of matter, Mr. Charles Morris on, 75 „ condition of matter, Mr. W. Crookes on, 90 „ condition of matter, Prof. A. Winchell on, 71 „ condition of matter, Prof. F. W. Clarke on, 98 „ condition of matter, Prof. Lodge on, 87 „ condition of matter, Sir B. Brodie on, 84 „ condition of matter, Sir W. R. Grove on, 78 „ evolution, 107 Proctor, R. A., on meteoric origin of solar system, 23 _Protyle_, the primal matter, 96 Prout’s Law, argument from, 92 Ramsay, Sir Andrew C, on denudation of Bristol coal-fields, 59 „ on denudation of Wales, 59 „ on geological time, 67 Reynolds, Prof., on Periodic Law 96 Rogers, Prof. H. D., on a great fault in the Appalachian coal-fields, 57 Roscoe, Sir H., on constitution of meteorites, 12 Rotation, supposed influence on denudation, 46 Saigey, M., on ethereal origin of matter, 87 Schmidt, Dr., on number of meteorites, 103 Solar nebula, M. Laplace on heat of, 30 „ Mr. Lockyer on condition essential to, 25 „ Sir W. Thomson on, 6, 28 Solar radiation, rate of, according to Pouillet and Langley, 35 Solar system, Mr. R. A. Proctor on meteoric origin of, 23 Star clusters, 34 Stars, evidence of evolution from their grouping, 81 „ how origin of by impact might not have been observed, 110 „ in four groups, 81 „ motion not accounted for by gravitation, 105 „ motion not due to their mutual attractions, 14 „ motion of, how in straight lines, 14