-328 Dr. Darlington's Pluviometrical Observations. 



fell either rain or snow, is about 91 out of 365; or about 

 one day in four, of the year. 



Table, showing the number of days of falling weather in 

 each month, in the years noted. 



The latter part of the summer of 1822, was marked by a 

 severe drought — so much so, that many wells and springs 

 dried up, which had never before failed within the memor}'' 

 of the oldest inhabitants. Even the rain which did fall, 

 seemed to be speedily dissipated, without producing any re- 

 freshing effect upon vegetation. The season was also re- 

 markable for the prevalence of intermittent fevers, in the 

 neighbourhood of West-Chester; a form of disease which 

 has hitherto been extremely rare in that vicinity. Along 

 the waters of the Schuylkill, and Susquehanna, fevers of a 

 more malignant type prevailed extensively. 

 I am, Sir, 



very respectfully, 



your most obed't. 



WM. DARLINGTON, 

 Prof. SiLLiMAN, New-Haven. 



