MOUNTAIN TREES 



relatives of these are the Tortricids or 

 Leaf-rollers which roll or fasten up 

 leaves in curious forms. A leaf-roller 

 of very peculiar interest because of the 

 queer pyramidal shelter it produces 

 works on the young leaves of the Cali- 

 fornia Laurel. The leaf is folded and 

 the edges fitted together with such nicety 

 that the larva's dwelling place must ever 

 remain a monument to insect artisan- 

 ship. 



On the trunks of the Kellogg Oaks 

 are often found great round excrescent 

 growths which are the result of the 

 trees' effort to seal over the stubs of 

 dead, broken limbs. The process of 

 covering begins at the base of the stub 

 and the laying on of layers of tissue 

 often continues until the dead wood is 

 entirely engulfed in living tissue. Even 

 after this isolation of unsound wood is 

 accomplished the abnormal tissues often 

 continue to grow, layer after layer of 

 wood being laid on, until occasionally 



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