The 18th century was a wealth of knowledge, exploration and rapidly growing technology and expanding record-keeping made possible by advances in the printing press. In its determination to preserve the century of revolution, Gale initiated a revolution of its own: digitization of epic proportions to preserve these invaluable works in the largest archive of its kind. Now for the first time these high-quality digital copies of original 18th century manuscripts are available in print, making them highly accessible to libraries, undergraduate students, and independent scholars. Medical theory and practice of the 1700s developed rapidly, as is evidenced by the extensive collection, which includes descriptions of diseases, their conditions, and treatments. Books on science and technology, agriculture, military technology, natural philosophy, even cookbooks, are all contained here. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to insure edition identification: ++++ Library of Congress W020216 Bookseller's advertisements, p. 4 and [38-40]. Also issued as part of 'Miscellaneous pamphlets, chiefly on American affairs', Philadelphia, sold by Mathew Carey. First published in 1639 as 'A discovery of subterraneall treasure'. Philadelphia: Printed and sold by Robert Bell, in Third Street, M, DCC, LXXXIV. [1784]. 37, [3] p.; 8°