0/. ZZ 4Z 6% 8Z 



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Fig. 5. — Proportionate amount of spiral in small, medium, and large trees 



Curve I, trees i inch to 8 inches, inclusive. Curve 2, trees 9 inches to 13 inches, inclusive. 

 Curve 3, trees 14 inches and larger. Vertical Co-ordinate A, straight trees. Vertical Co-ordi- 

 nate B, trees straighter than i inch in 40 inches. Vertical Co-ordinate C, trees straighter 

 than I inch in 30 inches. Vertical Co-ordinate D, trees straighter than i inch in 20 inches. 

 Vertical Co-ordinate E, trees straighter than i inch in 15 inches. Curve 4, showing propor- 

 tionate amount of spiral in trees 14 inches and larger. Taken for comparison from 598 trees 

 on the northeast side of Brandreth Lake, on the Brandreth estate. 



