Chase. J "i'* [Feb. 4, 



MONTHLY VAEIATIONS OF EAINFALL AT PHILADELPHIA. 



By Pliny Earle Chase. 



Bead Feh. 4, 1870. 



The following Tables may be of service in the stiidy of secular rainfall. 

 The Normals, in Table II. were computed from the observations of seven 

 successive years, in the same manner as those in my previous discussions. 



I. Monthly Rainfall at Philadelphia, for Forty-five Years. 



