22 



BULLETIN 1113, U. S. DEPARTMEXT OF AGEICULTURE. 



gratifying that the percentage of failures is no higher than it is. 

 It is felt that under the conditions obtaining the percentage of suc- 

 cesses is very satisfactory and indicates not only the possibilities of 



20 



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Fig. 13. — Diagrammatic representation of the average and maximum lieights in 1920 of 

 each species of tree planted as shelter belts in the States of Montana, North Dakota, 

 South Dakota, and Wyoming in 1916. The heavy lines indicate the average growth 

 and the light lines the maximum growth. 



growing shelter belts but the interest the settlers and the farmers of 

 the region have in them. 



