14 



MASS. EXPERIMENT STATION BULLETIN 397 



Figure 5. A. Frost crack which healed. Closing was complete, but cutting back of bark to 

 healthy tissue and sterilization and dressing of wound were necessary to promote satisfactory 

 wound healing. 



B. A treated hurricane wound in which the bark was cut back to a smooth regular 

 contour and shellacked. Wound dressing was applied to wood. Complete healing of the wound 

 may be expected in such cases. 



