52 The Ohio Journal of Science [Vol. XIX, No. 1, 



them had almost succeeded in getting their roots through the 

 ash layer and into the original soil beneath. When this con- 

 nection is once made, the seedling is removed from the problem 

 of re vegetation of the ash, and the factors controlling its success 

 or failure are the same as those affecting similar seedlings out- 

 side the ash-covered area. 



SALT MARSHES RESTRICTED BUT RETURNING. 



Another type of habitat, whose re vegetation requires separate 

 consideration, is the area formerly covered by salt marshes. 



Photograph by R. F. Griggs 

 A SALT MARSH ON CH-INITNA BAY. 



Giving a very good idea of the general character of the salt marshes of the 

 devastated district before the eruption. 



This association throughout the southern shore of Alaska 

 differs considerably from the more familiar salt marshes of 

 lower latitudes in the greater simplicity of its composition. 

 For here, instead of being a varied association including Sali- 

 cornia and other plants conspicuously adapted structurally 

 for a halophytic existence, the salt marsh is often composed 

 of a pure stand of a single grass, Puccinellia sp. When other 

 plants occur they are in such small numbers and so scattered 

 that they may be considered as accidental rather than as 

 forming definite components of the association. 



