1254 
Journal of Agricultural Research 
Vol. XXVIII, No. 12 
Fig. 1.—Compilation of data collected on the 31.6-acre experimental area in 1918. Each square 
represents one-sixteenth acre» and the numbers in the squares represent the percentage of pines 
infected when the pines were examined in detail in 1918. 
INFLUENCE OF WIND 
Fig. 2.—Data collected on the 31.5-acre experimental area. Figures represent per cent of infected pines in 
each quadrant by 100-foot zones. 
