[8] The density of the sun is about as great as the density of water.
[9] Herschel, 827-832.
[10] Cosmos, iii. 169, 205, and 641.
[11] Ibid., iii. 172 and 252.
[12] Astron. Soc. Notices, Dec. 13, 1850.
[13] See Grant's Hist. of Physical Astronomy, p. 538.
[14] I am aware of certain speculations, and especially of some recent ones, tending to show that even our Sun is wasting away by the emission of light and heat; but these opinions, even if established, do not much affect our argument one way or the other.
[15] Chalmers' Astron. Disc. p. 39.
[16] Hersch. 820.
[17] The periodical character of this star was discovered by David Fabricius, a parish priest in East Friesland, the father of John Fabricius, who discovered the solar spots. (Cosmos, iii. 234.)