As regards the subjects of this work, it is in our power to do much in the department of the natural history of this country. Our Zoology has been more fully investigated than our mineralogy and botany; but neither department is in danger of being exhausted. The interesting travels of Lewis and Clark have recently brought to our knowledge several plants and animals before unknown. Foreign naturalists frequently explore our territory; and, for the most part, convey to Europe the fruits of their researches, while but a small part of our own productions is examined and described by Americans: certainly, this is little to our credit, and still less to our advantage. Honourable exceptions to the truth of this remark are furnished by the exertions of some gentlemen in our principal cities, and in various other parts of the Union.[2] Our botany, it is true, has been extensively and successfully investigated; but this field is still _rich_, and rewards every new research with some interesting discovery. Our mineralogy, however, is a treasure but just opened. That both science and art may expect much advantage from this source, is sufficiently evinced by the success which has crowned the active efforts of a few ardent cultivators of this science: several new species of minerals have been added to it in this country; great numbers of American localities discovered, and interesting additions made to our materials, for the useful and ornamental arts. The science of mineralogy is now illustrated by courses of lectures, and by several good cabinets in the different states. Among the cabinets, the splendid collection of Colonel Gibbs, now in Yale College, (a munificent DEPOSIT for the benefit of his country,) _stands pre-eminent_: it would be considered as a very noble cabinet in any part of Europe: and its introduction into the United States, and its _gratuitous_ dedication to the promotion of science, are equally advantageous to the community, and honourable to its patriotic and enlightened proprietor. Mineralogy is most intimately connected with our arts, and especially with our agriculture. Such are the disguises worn by many most useful mineral substances, that an unskilful observer is liable to pass a thing by, as worthless, which, if better informed, he would seize with avidity; and, still more frequently, a worthless substance, clothed perhaps in a brilliant and attractive exterior, excites hopes altogether delusive, and induces expense, without a possibility of remuneration. A diffusion of correct knowledge on this subject is the only adequate remedy for either evil.