﻿BRIEFER ARTICLES 



C. DIFFERENCES BETWEEN TEMPERATURE OF AIR AND OF SOIL ON 



bog and hard land (Mather, Wisconsin, May 13 — 

 October 31, L907) 

 1. Mean temperature of soil obtained by averaging the mean at 

 6 P.M. with that at 7 A.M. (table 19, p. 82).— 



Mean temperature of air obtained by averaging the mean 

 with the mean minimum in each case. — Data from table 

 17, p. 78, table 13a, p. 69, and a letter to the reviewer from Pro- 

 fessor Cox. 



3. Comparison of differ 



It thus appears that 

 much greater difference 

 that of the soil 



possible comparisons there w 

 :n the temperature of the air 

 the bog than on the neighboring hard land. 



VIND VELOCITY 



The following facts regarding the mean velocity of the wind 

 over the upland and over the marsh in miles per hour for the 



