HONOURABLE SIRS, To whom, so properly as to your selves, could I have inscribed a work, of which the foundation was laid, and a great part of the superstructure finished, from experience acquired in your service? The additions furnished by my researches in the Levant, can only be considered as a verification, in Plague, of the principles, which I had previously ascertained to be correct, as applied to other acute maladies. The entire independence, in the treatment of diseases, enjoyed by practitioners in your service, both at sea, and on shore, chiefly in consequence of the superior or