Bui. 1105, U. S. Dept. of Agriculture 



PLATE III 



Fig. I. 



Fig. 2. 



F 43835A 



Figs. I and 2. — A Clay Flat on Which Reproduction Has Made Almost 

 Imperceptible Progress in 10 Years, Despite Adequate Seed Trees 

 and Complete Protection. 



The causes are a stone-free clay soil and a dense growth of bunchgrass. Upper photograph taken 



in 1909, lower in 1919. 



