[31]. Plato, Symposium.
[32]. Guizot, France, chap. V.
[33]. There is a fuller discussion in the chapter on The Sphere of Pecuniary Valuation.
[34]. James Logan in System, December, 1916.
[35]. Henry Ford in System, November, 1916.
[36]. H. G. Wells.
[37]. Kuno Francke in the Atlantic Monthly, November, 1914.
[38]. The Atlantic Monthly, September, 1911.
[39]. Areopagitica.
[40]. The Survey, vol. 29, p. 419.