6. Where a catarrhal fever ensued, I used bleeding and blisters. In those cases in which this fever terminated in an intermittent, or in a mild typhus fever, I gave the bark with evident advantage. In that case of measles, formerly mentioned, which was accompanied by symptoms of cynanche trachealis, I gave calomel with the happiest effects. In the admission of _fresh air_ I observed a medium as to its temperature, and accommodated it to the degrees of action in the system. In different parts of the country, in Pennsylvania and New-Jersey, I heard with great pleasure of the _cold air_ being used as freely and as successfully in this disease, as in the inflammatory small-pox. The same people who were so much benefited by _cool air_, I was informed, drank plentifully of cold water during every stage of the fever. One thing in favour of this country practice deserves to be mentioned, and that is, evident advantage arose in all the cases which I attended, from patients leaving their beds in the febrile state of this disease. But this was practised only by those in whom inflammatory diathesis prevailed, for these alone had strength enough to bear it. The convalescent state of this disease required particular attention. 1. _A diarrh[oe]a_ often continued to be troublesome after other symptoms had abated. I relieved it by opiates and demulcent drinks. Bleeding has been recommended for it, but I did not find it necessary in a single case. 2. An _opthalmia_ which sometimes attended, yielded to astringent collyria and blisters. 3. Where a cough or fever followed so slight as not to require bleeding, I advised a milk and vegetable diet, country air, and moderate warmth; for whatever might have been the relation of the lungs in the beginning of the disease to cold air, they were now evidently too much debilitated to bear it. 4. It is a common practice to prescribe purges after the measles. After the asthenic state of this disease they certainly do harm. In all cases, the effects of them may be better obviated by diet, full or low, suitable clothing, and gentle exercise, or country air. I omitted them in several cases, and no eruption or disease of any kind followed their disuse. I shall only add to this account of the measles, that in several families, I saw evident advantages from preparing the body for the reception of the contagion, by means of a vegetable diet. AN ACCOUNT OF _THE INFLUENZA_, AS IT APPEARED IN PHILADELPHIA, IN THE AUTUMN OF 1789, IN THE SPRING OF 1790, AND IN THE WINTER OF 1791.