FIRST SUPPLEMENT 



TO THE 



PHILADELPHIA 



MEDICAL AND PHYSICAL JOURNAL, 



I. Sketch of the Medical Topography of the country that 

 is watered by the upper streams of the Mohawk- Ri- 

 ver, and the adjacent streams of the Oneida- Lake, 

 &?<;., in the State of New -York. In a letter from 

 Mr. Matthew Brown,;'««.,/oDavidHosace, 

 M. Z)., of New-York. Communicated to the Edi- 

 tor, through the hands of Dr. William Currie, 

 of Philadelphia, by Dr. Ho sack. 



Sir, 



YOUR letter of September last was duly re- 

 ceived. I sincerely lament the occasion which again 

 called forth inquiries into the " nature and origin of 

 the Yellow-Fever," and the dangers you must have 

 encountered in the inquiry. The advantages of those 

 inquiries, if you can arrive at the truth, are honoura- 

 ble to yourself, and incalculable to your city, and to 

 the world at large. My apology for not answering 

 your letter immediately is, that, at the time of receiv- 

 ing it, I was much engaged in professional business, 



