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- [Footnote: for 1847, S. 176.) The great height to which the snow line
on the northern side of the Himalaya is raised in summer, by the influence of the heat returned by radiation from the high plains of the interior of Asia, renders those mountains, although situated in 29 to 30-1/2 degrees of latitude, as accessible as the Peruvian Andes within the tropics. Captain Gerard has attained on the Tarhigang an elevation as great, and perhaps (as is maintained in the Critical Researches on Philosophy and Geography) 117 English feet greater than that reached by me on the Chimborazo. Unfortunately, as I have shewn more at large in another place, these mountain journies beyond the limits of perpetual snow (however they may engage the curiosity of the public) are of only very inconsiderable scientific use.]*
