22 
BULLETIN 1113, U. S. DEPARTMENT OF AGRICULTURE. 
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 
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Fig. 13. — Diagrammatic representation of the average and maximum heights 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. 
