10 TRAVELS IN THE CONFEDERATION 



by the country people of several regions (p. 213, 228), 

 that new-made dams and mill-ponds are the cause of 

 intermittent fevers, less frequent previously in those 

 parts, have been confirmed by Dr. Rush in a treatise of 

 his to be found in the 2nd volume of the American 

 Philosophical Transactions (vid. Gott. Anzeigen, art. 

 176, 1787) who likewise believes the causes of the in- 

 creasing bilious and intermittent fevers in Pensylvania 

 to be the greater number of mill-ponds, the clearing- 

 off of the forests which had been a protection against 

 the exhalations from standing water, and the far more 

 frequent rains of the past few years. 



Bayreuth, nth January 1788. 



