IMPROPER CUTTIXi; OF LIMBS 



81 



knot whenever the saw cut across the old stub. 

 It' the knot were loose, it would fall out, and 

 the hoard would have a knot-hole. Knots and 

 knot -holes in boards, therefore, represent cross- 



73. Improper cutting of a limb. 74. Proper cutting of a limb. 



sections of branches ; and each one is the record 

 of an event in the history of the tree. 



A limb was sawn from a -tree. Several years 

 afterwards a drawing was made of the stub 

 (Fig. 73). The limb had not yet healed-in. 

 The reason is apparent: the stub had been left 

 so long that the tissue had not yet been able to 

 pile up over it, and, having no life in itself, 

 F 



