islands and were beginning to push up the great river valleys, the greater part of Alaska was in 1879 still unexplored, its fiords uncharted since Vancouver's day. With Fort Wrangell as his base, Mr. Muir made several short steamer trips, which gave him the opportunity to learn something of the glaciers and forests of the vicinity. After his return from an extended trip up the Stickeen River in October, he set out with Mr. Young, a Wrangell missionary, and a crew of Indian canoe men, to visit the fiords to northward, near the country of the war like Chilcat tribes. Their eventful journey culminated in the discovery of Glacier Bay and its glorious company of glaciers, the largest of which bears Mr. Muir's name. The following year he continued his explorations, particularly in the region of Sum Dum Bay and the Taku Fiord, and in 1890 returned a third time to the Muir Glacier for a more extended exploration of its upper fields and study of its flow.