[508] Grove, Correlation of Physical Forces, 3rd edit. p. 118.
[509] Ibid. pp. 166, 199, &c.
[510] Philosophical Transactions, 1861. Chemical and Physical Researches, p. 598.
[511] Life of Sir W. Hamilton, p. 439.
[512] Powell’s History of Natural Philosophy, p. 201. Novum Organum, bk. ii. Aphorisms 5–7.
[513] Thomson and Tait, Treatise on Natural Philosophy, vol. i. pp. 346–351.
[514] Philosophical Transactions (1740), vol. xli. p. 454.
[515] Principia, bk. i. Law iii. Corollary 6.
[516] Helmholtz, Taylor’s Scientific Memoirs (1853), vol. vi. p. 118.
[517] Lucretius, bk. i. lines 232–264.