[2] Examen Comparatif des Principales eaux Minérales Salines de France et d'Allemagne, par MM. L. Figuier et Mialhe. Read at the Académie de Médecin, 23rd of May, 1848.
[3] Sir J. Herschel's "Physical Geography," p. 22, gives the basis and details of this calculation.
[4] "La Terre et les Mers," p. 517. Troisième Ed.
[5] "Outlines of Comparative Anatomy."
[6] "Cours de Paleontologie Stratigraphique."
[7] "On en a vu vivre deux et même trois ans, sans recevoir de nourriture."—Vie des Animaux, p. 117.
[8] The term bivalve as constituting a class must be taken in a limited sense, for several genera, as pholas for example, have six or more valves.
[9] We give this illustration as representing the comparative size of the oysters at different ages; but it is necessary to state that the specimens were artificially attached to the block by means of glue for exhibition. Oysters always attach themselves by the back of the rounded shell near to the hinge, as stated at p. 363.
[10] The cause of the present scarcity of oysters is a much-vexed question. Mr. Frank Buckland, the greatest living authority on oyster and fish culture, attributes it to sudden changes of temperature at the critical period when the spat is newly formed, rather than to over-dredging.—Ed.
[11] The Brachiopoda may be thus tabulated:—