The work which he inspired and to which he contributed the most important creative elements, I believe to be at least as important as that for which his name stands directly responsible."* * Science, Oct.

10,1902.

See also "John Wesley Powell," edited by G.
K.Gilbert, reprinted from The Open Court, 1903.
In the field of geology he was particularly facile in the invention of apt descriptive terms, and indeed he was never at a loss for words to express new meanings, coining them readily where none had existed that were appropriate.

Some of his ideas have been developed by younger men, till they have become distinct divisions of the larger science to which they belong.

His greatest work in the Geological Survey, that which was more the result of his personal effort, may be summed up under three heads: First, the development of a plan for making a complete topographic map of the United States; second, the organisation of a Bureau for the collection of facts and figures relating to the mineral resources of the country; and third, his labours to preserve for the people the waters and irrigable lands of the Arid Region.