The virtues of wild valerian in nervous disorders : And the manner of taking it, against vapours and melancholy, as tea; against fits, and hysteric complaints, in the powder; and against confused thoughts, and paralytic complaints, in the tincture. With directions for gathering and preserving the root; and for chusing the right kind when it is bought dry. Shewing that the uncertainty of effect in this valuable medicine, is owing to adulteration or ill management. Illustrated with figures; exhibiting the true and false root, and the entire plants. The tweflth edition. By J. Hill, M.D. member of the imperial academy.