[1] March 31, 1845.
[2] Professor Nicol of Aberdeen believes the Red Sandstones of the West Highlands are of Devonian age, and the quartzite and limestone of Lower Carboniferous.—See Quarterly Journal of the Geological Society, February 1857.—W.S.
[3] Sir R. Murchison considers these rocks Silurian. See "Quarterly Journal" of the Geological Society, Anniversary Address.
[4] Probably one of the Isastrea of Edwards.
[5] See a paper by the Rev. P.B. Brodie, on Lias Corals, "Edinburgh New Philosophic Journal," April, 1857.
[6] The verses here referred to are introduced into "My Schools and Schoolmasters," chapter tenth.
[7] For a description of this pond see "My Schools and Schoolmasters," chapter tenth.
[8] These remarks refer to the poem "On Seeing a Sun-Dial in a Churchyard," which was introduced here when these chapters were first published in the "Witness," but, having been afterwards inserted in the tenth chapter of "My Schools and Schoolmasters," is not here reproduced.
[9] Mr. Peach has discovered fossils in the Durness limestone, which rests above the quartzite rock of the west of Scotland, that covers the Red Sandstone long believed to be Old Red. The fossils are very obscure.—W.S.S.
[10] This second title hears reference to the extent of the author's geologic excursions in Scotland, during the nine years from 1840 to 1848 inclusive.