[291] Thomson and Tait, "Natural Philosophy," vol. i. p. 164.
[292] Nature, vol. viii. p. 280; also Challis, "Principles of Mathematics and Physics," pp. 685-687.
[293] American Journal of Science and Arts, vol. xlix. pp. 32, 33.
[294] How gravitation may result from the interception of the Cosmic Force of Repulsion is explained by Prof. Norton at pp. 26-28, and still more fully in vol. iii. 3d Series, May, 1872, pp. 332, 336.
[295] American Journal of Science and Arts, vol. xlix. p. 34.
[296] American Journal of Science and Arts, vol. xlix. p. 33.
[297] See vol. i. pp. 217-284.
[298] "Intellectual System of the Universe," vol. i. p. 224.
[299] Ibid. p. 271.
[300] Ibid. p. 244.