322 



ENVIRONMENTAL CONDITIONS. 



power of the air, and how readily it might have been and may be 



studied. 



Summer evaporation, 1908, as shown hy geographic profiles. — To 

 obtain another kind of picture of the geographical variation in summer 

 evaporating power of the air, as brought out by the 15- week means, 

 attention may be directed to the 6 profiles shown in figure 13. These 

 profiles aim to present graphically the changes in summer evaporation 

 intensity to be encountered in traversing the country from west to 

 east and from north to south. Two west-east profiles are shown, one 



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Fig. 13. — Evaporation profiles, weekly rates, summer of 190S, with vegetation indicated. The 

 lines along which these profiles are constructed are indicated on Plate 56. 



passing from Seattle, Washington, to Fredericton, New Brunswick; 

 the other passing from San Diego, California, to West Raleigh, North 

 Carohna. Three north-south profiles are presented, the first passing 

 from Regina, Saskatchewan, to Cameron, Louisiana; the second from 

 Houghton, Michigan, to Miami, Florida; and the third from Frederic- 

 ton, New Brunswick, to Miami, Florida. Those of our stations through 



