☞ An epistle to Dr. Richard Mead, concerning the epidemical diseases of Virginia, particularly, a pleurisy and peripneumony : wherein is shewn the surprising efficacy of the seneca rattle-snake root, in diseases owing to a viscidity and coagulation of the blood; such as pleurisies and peripneumonies, these being epidemick, and very mortal in Virginia, and other colonies on the continent of America, and also the Lee-Ward Islands : to which is prefixt, a cut of that most valuable plant : and an appendix annexed, demonstrating the highest probability, that this root will be of more extensive use than any medicine in the whole materia medica, and of curing the gout, rheumatism, dropsy, and many nervous diseases.