This rare book contains the account of John Tyndall's attempt to scale the Aletschhorn, one of the highest peaks in the Alps. This thrilling text is both informative and exciting, detailing a perilous mountaineering expedition before the advent of the plethora of safety gear enjoyed by mountaineers today. John Tyndall was a seminal physicist in the 19th century. While researching his 1860 work, The Glaciers of the Alps, Tyndall became an accomplished climber and went on to write a number of fantastic books detailing various mountaineering expeditions. This book has been chosen because of its significant historic value and with the hope that such literature can be enjoyed for years to come. We are proud to republish this scarce book with an introductory biography of the author.