Note 223 — APPENDIX. (continued 2)
Reading edition
On the theory of the isothermal lines, see the papers of Kupfer in Poggend., Ann., bd. xv., s., 184, and bd. xxxli., s. 270, in the Voyage dans l'Oural, p. 382-398, and in the Edinb. Journal of Science, new series, vol. iv., p. 355. See, also, Kamtz, Lehrbuch der Meteor, bd. ii., s. 217, and on the ascent of chthon-isothermal lines in mountainous countries, Bischoff, s. 174-197; Humboldt's Cosmos, vol. i., p. 347.