Bui. 1176, U. S. Dept. of Agriculture. 
PLATE IV. 
Fig. 1. — A group of trees lefl alter cutting. Groups as dense as this do not permit reproduc- 
tion, growth of the trees is seriously retarded, and they show litlle or no response to cutting 
in the form of increased growth. Plumas National Foresi . 
Fig. -'.—Abundant advance reproduction of western yellow pine on an unfavorable site where 
the condition of the natural stand resembles that which would be secured by a first cut tin- 
under the shelterwood system. The primary object of cutting should be to release and 
preserve such reproduction. Lassen National Forest. 
