Letter from Joseph Prestwich, on his paper 'On underground temperature; with observations on the conductivity of rocks; on the thermal effects of saturation and imbibition; and on a special source of heat in mountain ranges' to the Secretary of the Royal Society Wishes to postpone the printing of his paper until after the next Council Meeting in October. Subject: Geology [Published in Proceedings of the Royal Society, 1886]. 31 July 1885