[271] "Principia," Def. viii. p. 8.
[272] "Does every grain of salt and pepper in a million salt-cellars and pepper-casters individually and separately pull and actually move the sun and fixed stars?"—De Morgan.
[273] North British Review, vol. xlviii. March, 1868, p. 125.
[274] Third Letter to Bentley.
[275] Nature, vol. iii. p. 51; vol. ii. p. 422.
[276] Nature, vol. i. p. 551.
[277] Delivered at the Royal Institution, and reported in Nature, vol. vii. Nos. 174, 175.
[278] North British Review, vol. xlviii. March, 1868; "Correlation and Conservation of Forces," p. 368; Amer. Jour. of Science and Arts, vol. xlix. p. 24.
[279] North British Review, vol. xlviii. p. 127; Nature, vol. vii. p. 343.
[280] "Familiar Lectures on Science," p. 90.