A. R. Sanderson and H. Sutcliffk 65 



Fig. 3. In this specimen 20 inches of bark have been removed on the new cut. Fifteen 

 inches of tapped surface is almost completely destroyed. The lowest five inches (B) 

 shows the disease is still present in a virulent form. 



Note the portion (A) where open wounds extend across the tapped surface. 

 The portion C-D had been treated (too late) several times with an antiseptic cover. 

 The fungus is present in the wood and has already passed below the present cut, 

 hence the disease will persist so long as tapping continues. The tree figured was one 

 similar to that in fig. 2. The whole of one tapped surface (over 3 ft.) was completely 

 ruined, and the second cut, which showed infection almost immediately after opening, 

 is merely a repetition of what occurred on the previously tapped surface. 

 Fig. 4. Photograph showing tapped surface and tapping cut of a normal 15 year old 

 Hevea tree unaffected by disease. 



Ann. Bio]. Vii 



