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 form Mr. Boone, practitioner in physic to that Garrison for three years, to Dr. Brocklesby