8 BORTHWICK—LIGHTNING-STROKE ON TREES. 
Explanation of the Plates VI. and VII. 
Fic. 1.—Portion of stem of lightning-struck oak sueres Rubur) from 
Metres Castle, Perthshire. Seen in transverse section 
Fic. 2.—Portion of stem of lightning-struck oak eee Ilex) from the 
-Royal Botanic Garden, Edinburgh. Seen in transverse section. 
