

Nov., 1918] Recovery of Vegetation at Kodiak 



23 



in determining the character of the vegetation in the station, 

 which, before the eruption, was occupied by a typical arctic- 

 alpine heath. Instrumental records giving comparative hourly 

 evaporation rates in such stations and the lowland would 

 be of great interest. 



More significant than the differences between the different 

 habitats is a comparison of the evaporation rate of the region 

 as a whole with that of other regions. Unfortunately, how- 

 ever, comparable data are very scanty. Briggs and Shantz 



Photograph by R. F. Griggs 



THE SAME STATION TWO YEARS LATER. 



September 12, 1917. All but one of the lupines winter killed but many new ones 



have started. Many clumps of Agrostis hiemalis. Old clumps 



of grass much enlarged. 



have shown 19 that records of the different types of instruments 

 employed for measuring evaporation are not closely comparable. 

 Although porous-cup atmometers of the general type used in 

 the present investigation, have been employed for a number 

 of years in ecological research, it is only recently that the 

 instrument has been sufficiently perfected to correct the errors 



19 Briggs, L. J., and Shantz, H. L. Comparison of the Hourly Evaporation of 

 Atmometers and Free Water Surfaces with "the Transpiration Rate of Medicago 

 sativa. Jour. Ag. Research 9: 277-292. Pis. 4-6. 1917. 



