Plate XXiil. — Wintek-injuked Thee Trunks. 



A, Acer saccharinum with injury on southwest side, occurring 

 in winter of 1909-10, followed by double regeneration hke that 

 shown in Plates XX, XVI B, and XXII; B, apple tree trunk 

 with cleft in bark, from winter of 1910-11. 



(Photographed, A on July 2, 1911, and B on July 23, 1911.) 



