Observations on the Tellow-Fevcr. 2kh 



and wharves were in their infancy; and, of course, 

 when that combination of causes, which have been 

 assigned by the advocates of the domestic origin of 

 the yellow-fever, had no existence, or existed in a 

 very partial ^nd limited degree. 



You have also shown, by an enumeration of facts, 

 which are fresh in the memory of multitudes, that in 

 those cities, where all the causes, to which it has been 

 imputed by the believers in the domestic origin of the 

 disease, existed, in much greater abundance, for many 

 years previous to 1793, than since that period, no yel- 

 low-fever made its appearance; and, consequently, 

 have proved the insufficiency of those causes to pro- 

 duce it. 



So far, my sentiments correspond, exactly, with 

 yours; but I cannot agree with you, when you reject 

 all other causes, and have recourse to a supposed 

 change in the constitution of the atmosphere, to ac- 

 count for the origin of a disease so violent in its symp- 

 toms, so rapid in its progress, and so generally fatal 

 in its termination, and with which all the physicians 

 in this country, who had entered into practice since 

 1762, were entirely unacquainted, at the time of its 

 occurrence in Philadelphia, in the year 1793. 



As the establishment of truth, on this subject, is of 

 the greatest importance, not only to this country, but 

 to all others with which it has commercial intercourse, 

 } request your patient attention, while I endeavour to 



