THE WILDWOODS 



31 



On the whole, then, we see that most of our trees require 

 a moderate amount of moisture in the soil and in the air, 



FIG. 16. Cypress Swamp 



The short stumplike structures projecting out of the water are the 

 "cypress knees," peculiar outgrowths from the roots of these 

 trees, apparently dependent on the wet surroundings 



and that too much as well as too little water is fatal to 

 most of them. It seems also that drought is best endured 



