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CIRCULAR 6 5 6, U. S. DEPARTMENT OF AGRICULTURE 



OCT., NOV. 



DEC..JAN.,FEB. MAR..APR..MAY JUNE, JULY. AUG-SEPT. 

 MONTHS OF WOUNDING 



Figure 4. — Diagrams of average wounds in October or November of the first 

 growing season after treatment determined by grouping into four seasonal 

 groups the data by months in figure 1. In the diagrams, the circle represents 

 the original wound (25 millimeters in diameter) and the ellipse, the shape of 

 the wound when measured. The longitudinal diameter of the wound is repre- 

 sented by the long axis of the ellipse and the transverse diameter by the short 

 axis. The shaded areas between circle and ellipse represent healing callus, 

 and the unshaded parts of the ellipse outside the circle represent extension or 

 enlargement of the original wound. Each diagram in the first column was based 

 on the average of approximately 20 wounds, each in columns 2 and 3 on ap- 

 proximately 30 wounds, and each in column 4 on approximately 40 wounds. 



