EXERCISE 71 (Continued) 



the branch ? If this branch were buried deeply by the farther 

 growth of the tree and boards were sawed from this part of 

 the trunk, would the resultant knots be loose or solid ? What, 

 then, is the origin of knotholes in boards ? 



If trees are planted with the intention of producing lumber, 

 should they be planted close together or far apart ? What 

 advantages would accrue, in the amount and quality of the 

 product, by the method you suggest ? How would you decide, 

 in looking over a grove, whether the trees had been planted at 

 the right distance apart? 



References 



BERGEN and CALDWELL. Practical Botany, pp. 66, 67. 

 BERGEN and CALDWELL. Introduction to Botany, pp. 77-79. 



[88] 



