[12] Cf. Ph. L., pp. v.-vi. 3.
[13] Cf. Pieri, R. M. M., March 1906, p. 199.
[14] As a type of these, Humpty-Dumpty, with his inability to admit anything not empirically given and his lack of comprehension of pure mathematics, may be taken (see [Appendix C]). In his (correct) thesis that definitions are nominal, too, Humpty-Dumpty reminds one of J. S. Mill (see [Appendix D]).
[15] See Frege, Gg., ii. p. 253.
[16] See [Appendix E].
[17] See Frege, Gg., i. p. 15.
[18] See the above references and also [Appendix F].
[19] Cf. B. Russell, H. J., July 1904, p. 812.