Oeconomical and medical observations, in two parts. From the year 1758 to the year 1763, inclusive. Tending to the improvement of military hospitals, and to the cure of camp diseases, incident to soldiers. To which is subjoined, an appendix, containing a curious account of the climate and diseases in Africa, upon the great river Senegal, and farther up than the island of Senegal. In a letter from Mr. Boone, practitioner in physic to that garrison for three years, to Dr. Brocklesby