[30] Rivers, Mountains, and Sea-coast of Yorkshire, 8vo. 1854, p. 34.
[31] On the Ordnance Maps it is wrongly printed Alum Pot.
[32] Op. cit. Article Grottes.
[33] L’Homme pendant les Ages de la Pierre dans les Environs de Dinant sur Meuse, Bruxelles, 1871.
[34] The bare pavements above Malham Cove are worthy of a careful examination.
[35] I have used the term incretionary as implying an accumulation of mineral matter from the circumference of a cavity towards its centre, as in the case of an agate. Concretionary action, with which it is generally confused, ought to be defined as the deposition of successive layers of matter round a nucleus or centre. The one action operates from the circumference to the centre, the other from the centre to the circumference.
[36] Corals and Coral Islands, 1872, p. 361.
[37] Prestwich, Ann. Address Geol. Soc. 1872, p. 84.
[38] Phil. Trans. April 7th, 1680, p. 731.
[39] “Ice-Caves in France and Switzerland.” Longmans, 1865, p. 296.