QUANTITATIVE STUDY OF AIR REACTIONS. 97 



(1913) on evaporation, Knuchel (1914) on quality of forest light, and of a 

 number of others who have investigated bog reactions or evaporation. The 

 first special study of evaporation and succession was made by Transeau (1908) 

 in the study of Long Island vegetation. Dachnowski (1912) has studied 

 the reactions in bog habitats, and Fuller (1911, 1912, 1913, 1914) has 

 investigated the relation of water-content and evaporation to the develop- 

 ment of the cottonwood-dune association and the oak-hickory association. 

 Gleason and Gates (1912) have made similar studies of evaporation in various 

 commimities in central Illinois. Pool (1914) has recently investigated the 

 water relations of sandhill seres, and Weaver (1914) has studied the relation 

 of evaporation to succession in the Palouse region of Idaho and Washington. 



