DIFF. OF TEMP. & REL. HUMID. IN CITY & COUNTRY. 73 



This table proves as a general rule, perhaps contrary to 

 preconceived opinion, that the Evaporation is less in the 

 country than in the city, and that, consequently, the Relative 

 Humidity is greater there, though the single data seem to be 

 so irregular as to suggest doubts as to their perfect reliability. 



The greatest difference in Evaporation as well as in Rela- 

 tive Humidity seems, on an average, to occur at the warmest 

 time of the day, at 2 P.M.; and the least difference of Evap- 

 oration at 7 A.M., and the least difference of Relative Hu- 

 midity at 9 P. M. The table proves further that the differ- 

 ences of Relative Humidity are much smaller in winter (No- 

 vember to February) than in the warmer months of the year. 

 It was found, on an average, to amount to nearly 5 per ct., 

 but in June and October it reached 7 per ct. ; while in Jan- 

 uary, February and November, it was under 3 per ct., 

 and in December it seems to have been even a little less in 

 the country than in the city. In winter and spring the dif- 

 ferences are much greater on mornings and evenings ; in the 

 latter part of summer and in fall, they are much higher in the 

 middle of the day than at any other period. 



Another interesting result of Mr. Fendler's observations is, 

 that the quantity of rain for the whole year was, at his place 

 of observation, over three inches less than I found it in town, 

 though in the months of August, September, November and 

 December he recorded a larger fall of rain than I did. A 

 difference in the instruments, or in their exposure, may ] tart- 

 ly account for the different results; but it coincides witli a 

 well known and often noted fact, that over a large city, and 



