[1] Darwinism and other essays, by John Fiske. (Macmillan, 1879.)

[2] Decimal classification and relative index, by Melvil Dewey, 15th ed. Boston, 1894.

[3] Manual of library classification and shelf arrangement, by James D. Brown. (Library Supply Co.) 1898. (pp. 105-160).

[4] Even a careful estimate made from the “copy” is liable to turn out wrong when the work is in type and the tendency is to overstate the number of pages, when the printer is within his rights, according to trade usages, in claiming for profit upon the full number of pages upon which his estimate was based, therefore it is better to have a saving clause as well as to leave a safe margin on the lesser side when calculating the number of pages.