Oaks 



97 



certain oak galls are gathered and sold for tanning, and 

 pyrogallic acid, which is used in photography, is made 

 from them. 



Oaks as shade trees. Besides the usefulness of their 

 wood, bark, acorns, and galls, oaks are desirable as shade 

 and ornamental trees. Oaks from the original forest, 

 left standing after the land has become the site of a 

 town or city, are often highly prized. The red oak is 

 considered one of the best of all our shade trees. It is 

 suitable for planting along broad streets. This species 

 and the scarlet and pin oaks grow more rapidly than 

 most of the other oaks. They are desirable as shade 

 trees on account of their durability, symmetry, beauty 

 of foliage, and comparative freedom from injury by 

 insects or fungi. 



Pan-American Union 



FIG. 59. Live oak near Sutherland Springs, Texas. The branches are 

 draped with Spanish moss. 



