In a region like the Yellowstone National Park, destined for all time to be a resort for the lovers of science and pleasure, this temptation was quite irresistible; so much so, that, when the expeditions of 1870 and 1871 left the field, they left little worth naming behind them. And yet the honor thus gained has not, we venture to say, been all that its votaries desired. Small is the number of tourists who stop to inquire for whom Mary Lake, DeLacy Creek, or Stevenson Island was named. Fewer still are aware that Mt. Everts was _not_ christened in honor of a distinguished American statesman of similar name, but in commemoration of one of the most thrilling individual experiences in American history. So with all these personal names. The lively satisfaction with which they were given finds no counterpart in the languid indifference with which the modern visitor mechanically repeats them. In as much as it fell to the lot of the United States Geological Survey to originate a great many of the names in our western geography, it is interesting to know from official sources the principles which governed in this important work. Writing upon this point, Dr. Hayden says:[BX] "In attaching names to the many mountain peaks, new streams, and other geographical localities, the discovery of which falls to the pleasant lot of the explorer in the untrodden wilds of the West, I have followed the rigid law of priority, and given the one by which they have been generally known among the people of the country, whether whites or Indians; but if, as is often the case, no suitable descriptive name can be secured from the surroundings, a personal one may then be attached, and the names of eminent men who have identified themselves with the great cause, either in the fields of science or legislation, naturally rise first in the mind." [BX] Page 8, Fifth Annual Report of Dr. Hayden. In the more recent and thorough survey of the Park by the United States Geological Survey, it became necessary to provide names for those subordinate features which, in a less restricted field, the early explorers had thought unworthy of notice. Professor Arnold Hague, upon whom this work has principally fallen, thus states the rule which he has followed:[BY] "In consultation with Mr. Henry Gannett, geologist in charge of geography, it was agreed that the necessary new names to designate the unnamed mountains, valleys, and streams should be mainly selected from the beasts, birds, fishes, trees, flowers, and minerals found within the Park or the adjacent country." [BY] Page 152, Part I, Annual Report United States Geological Survey for year ending June 30, 1887.