INDEX. . 85 



Page 



Walnut, black, red heart-rot, susceptibility 37 



white heart-rot, susceptibility 26, 33 



white. See Butternut. 



rot, susceptibility 48 



Water, ground, cause of disease in certain trees 13 



Waugh, F. A. , reference to work 18 



Weathering of timber as cause of decay 62 



White heart-rot. See Rot, heart, white, 

 oak. See Oak, white, 

 pine. See Pine, white, 

 rot. See Rot, white. 



Willow, heart-rot, susceptibility 42 



leaf-rust injury to osier willow plantations 19 



mildew injury 18 



sap-rot, occurrence 57 



white heart-rot, susceptibility 26 



rot, susceptibility 49 



Wind, injuries to trees 14 



Witches' broom formed by mistletoe, injuries to trees 16-17 



Wood, preservation by chemicals to prevent decay 66, 67 



rotting fungi, description, progress of decay 52-56 



structure, effect of Fomes igniarius 34-35 



Wound fungi causing diseases of forest trees 25-52 



parasites 25-52 



Wounds, tree, importance as causes of disease 14, 24, 25-52 



protection to prevent fungous growth 36, 37 



149 



