Expeditions organized or participated in by the Smithsonian . Fic. 2^.—dreat Xeodle in Yellowstone Canyon, a half mile below TowerFalls, shown by Fig. 24. Picture taken by hanging camera in limb of a treeabout 300 feet above top of Needle. Needle probably 400 to 600 feet in by Fig. 26.—Obsidian Cliff. Norris Geyser Basin, showing columnar structurein obsidian and massive-bedded rhyolite above. This cliff is one of theinteresting geological phenomena of the Park. Photograph by SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 66

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912