A systematic treatise, historical, etiological and practical, on the principal diseases of the interior valley of North America, as they appear in the Caucasian, African, Indian, and Esquimaux varieties of its population. This book, "Principal diseases", by Daniel Drake, is a replication of a book originally published before 1850. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible...