This book brings together works published between 1846 and 1859 by the Scot James D‎.‎ Forbes ‎(‎1809‎-68‎)‎ and Irishman John Tyndall ‎(‎1820‎-93‎)‎‎,‎ both of whom were experienced alpinists as well as glaciologists‎.‎ However‎,‎ their views on the motion of glaciers were disparate‎,‎ and a scientific quarrel over primacy and credit for discoveries continued even after their respective deaths‎.‎ These papers include Forbes‎'‎ articles on experiments on the flow of plastic bodies and analogies between lava and glacier flows‎,‎ and on the plasticity of glacier ice‎,‎ as well as Tyndall‎'‎s observations on the physical phenomena of various Alpine glaciers‎,‎ including the famous ‎'‎Mer de Glace‎'‎‎,‎ and a piece on the structure and motion of glaciers‎,‎ co‎-written with Thomas Huxley‎.‎ Several works by and about all three scientists ‎(‎including works on Alpine travel‎)‎ have also been reissued in this series‎.‎