United States of America, and the Southern parts of Europe, differ from the common exhalations of marshes, in _quality_, as well as degrees of concentration: but whether this difference be occasioned merely by the greater heat which, at such times, commonly exists in these towns than in the surrounding country, and which may exalt the powers of such _miasmata_, by perfecting the decompositions which produce them, or whether it be partly the result of a difference in the organized matters decomposed by that excessive temperature, I am unable to determine.” We must refer the reader to Dr. _Bancroft’s_[194] work for farther information upon the subject; and we have little doubt but that, after an attentive consideration of the rich store of facts and observations which this author has presented to us, he will be led to a conclusion in favour of the general non-contagious nature of this malady, although we by no means intend to deny that it never assumes the character of a contagious Epidemic. Sir Gilbert _Blane_, whose testimony upon this subject must necessarily have great weight, has made the following observations. “In that district of the globe in which are situated the islands called the Great and Little Antilles, also in the continental regions round the gulph of Mexico, and along the coast of South America, the fevers which prevail there have certain symptoms peculiar to themselves, and not occurring in any other part of the globe, except when carried from thence, which they sometimes have been, particularly to the sea-port towns of North America, and the South of Europe. The peculiarities alluded to, consist in a universal yellowness of the skin, and the vomiting of a dark coloured fluid, resembling the grounds of coffee.