CONTAINING 



The Role of Aspen in the Reforestation of Mountain Burns in Arizona 

 and New Mexico 

 By G. A. Pearson 249 



A Note on the Reversibility of the Water Reaction in a Desert Liverwort 



By W. A. Cannon 261 



Books and Current Literature 266 



Notes and Comment 271 



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Entered as second-clasa matter March 9, 1912, at the poat office at Baltimore, Maryland, under the Act of July 16, 1894 



