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 upon these circumstances, men of lonp ax- perience and approved judgment are alone coni1ded ln. ltthis, as 1t must be seen 10 be, IS ot so much consequence 10 individu- l ais, pi what immense importance Is it not to the State Governments, in putting their enuctmeBts into operation, 10 select lndlvidz uais of the greatest experience? For how IS that complex appearance Of rocks in diff. fefent parts of the same country, which. though altogether tiiiferen, in their external ehafacters, may be true equivalents of each other, to be recencied by men who bnve only studied them in books? or hove can mon cimm to have their opinions confided in ra- speetlng the tendency, direction. and ouaItv ol ine1aiiliefous yeIns, or the probable ex- lstence ot coal measures, upon which the outlay of great capitals depends, who have never been down in mine, and have stu died minerals only from cabinet spscimens9 in geology no learning can supply the place of experience. A geologist may be an iindlf. ierent analyst, but certainly no man should be presumed geologist merely because ho IS learned chemist or a profound mathe- inaticlan. Such an important trust, there lore, as IS comprehended in the geological survey of n State, should be confined only to men of long approved experience.

 Il have thought these observations not out ot place, because, in the ineipient en- eouragemeht now gwen to geology by some of the State Governments, and which will probably be done by all of them, t is iln- Poftant that the few individuals in the coun- try who have the requisite experience, should not De overlooked in favor Of others. who are perhaps not aware themselves of the extent of practical experience required to make any mans labors valuable, and wor. thy of being transferred to geological maps oi the countries they survey. It must be evident that geological map of any coun- try, upon which all the important mineral and metallic deposites should be accurate y lad down, with their direction, extent. and other important incidents belonging n them, would be of great value. How much, then, does 1t concern the interests of the United States, that rational estimates o1 the nationai resources, with all those in- .ailible indications which should precede internal improvements, and whatever else aPPenlains to monument of such singular importance to them as | general geological map would be, should be done with the ut- most accuracy. It seems called for both by the best interests and the reputation of the country.n