[Illustration: "WE OF THE FLANNEL SHIRT AND THE UNBLACKED BOOT." _Frontispiece._] As a geologist of the United States Geological Survey, I had the good fortune to be placed in charge of the first expedition sent by that department into the interior of Alaska. The gold diggings of the Yukon region were not then known to the world in general, yet to those interested in mining their renown had come in a vague way, and the special problem with which I was charged was their investigation. The results of my studies were embodied in a report entitled: "Geology of the Yukon Gold District," published by the Government.…
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