[154] Sir G. Airy. Encyclopedia Metropolitana, Art. Waves. Cited by Geikie, loc. cit., p. 438.

[155] Stevenson. Treatise on Harbors.

[156] Willis. Jour. of Geol., Vol. I, p. 481.

[157] Stevenson. Trans. Roy. Soc. Edin., Vol. XVI, p. 25. Treatise on Harbors, p. 42. Quoted by Geikie, Text-book of Geology, p. 437.

[158] Geikie. Text-book of Geology, 3d ed., p. 437.

[159] Brit. Assoc. Rept., 1850, p. 26.

[160] Davis. Physical Geography, p. 354.

[161] Dana. Manual of Geology, 4th ed., p. 219.

[162] Shaler. Sea and Land, p. 29.

[163] Gulliver, Shore Line Topography: Proc. Am. Acad. Arts and Sci., Vol. XXXIV, 1899, pp. 151–258. A valuable study of shore-line topography.