It may be remarked, that though all sores and wounds in the foot and leg are difficult of cure in a hot climate, I have observed, that, where the constitution is good, those in the thighs, arms, trunk, and head, are rather more easy of cure than in Europe, and that parts divided by incision very readily unite by the first intention. In reasoning upon this, it may be said, that as healing depends on a certain degree of vigour in the powers of life, this should not err either on the side of excess or defect. If it is too great, as in the case of a hale, plethoric constitution in a cold climate, too much inflammation is apt to be excited; and if too feeble, as happens in a hot climate, in the lower extremities, which are far removed from the source of life and circulation, the salutary effort is not strong enough to generate new organised parts. But in the trunk of the body, in such a climate, the powers of the animal œconomy are in that just medium which is most favourable to this operation of nature. THE END. APPENDIX TO PART III. It has been suggested to me, that it would add to the utility of this Work to subjoin a list of the remedies best suited to the practice of physic at sea, with their quantities, and to give a set of formulas for the direction of young practitioners. I have accordingly made out a gross computation of the requisite quantities of the most useful and necessary articles of the Materia Medica, and also a few of the most commodious and simple forms of administering some of the most efficacious remedies for the most common diseases. It is of consequence every where, but especially on board of a ship, to simplify practice, as much as possible, with regard to the number, the preparation, and the administration of medicines. Where a great number of compound medicines are given, it is extremely difficult to ascertain, by accurate and satisfactory observations, what are their real effects; and as there are not conveniences at sea for great pharmaceutical nicety, the plainest forms should be adhered to. And as all operations are rendered more practicable and easy by being reduced to a stated method, this is an additional inducement for studying plainness and simplicity in preparing and administering remedies. This uniformity is more attainable in the public service than in private practice; for in the former all the patients are of one sex, they are all adults, and they are generally of robust constitutions.