A medical sketch of the Synochus maligna, or malignant contagious fever; as appeared in the city of Philadelphia : to which is added, some account of the morbid appearances observed after death, on dissection. : With an appendix, containing, a short chemical analysis of the black matter ejected from the stomach, in the last stage of the yellow fever, with its dissimilarity to putrid bile, and its effects when applied to the healthy systems /