In 1879 John Muir went to Alaska for the first time. Its stupendous living glaciers aroused his unbounded interest, for they enabled him to verify his theories of glacial action. Again and again he returned to this continental laboratory of landscapes. The greatest of the tide-water glaciers appropriately commemorates his name. Upon this book of Alaska travels, all but finished before his unforeseen departure, John Muir expended the last months of his life. The events recorded in this volume end in the middle of the trip of 1890. Muir's tes on the remainder of the journey have t been found, and it is idle to speculate how he would have concluded the volume if he had lived to complete it. But one will read the fascinating description of the Northern Lights without feeling a poetical appropriateness in the fact that his last work ends with a portrayal of the auroras--one of those phemena which elsewhere he described as the most glorious of all the terrestrial manifestations of God.