EA 
49, Burred trees of the type represented on Plate XlIl and XIV are 
very seldom seen. The burrs in this case are no secondary wood-forma- 
tions in the cortex, but the central wood itself has an‘irregular surface, not 
only on the stem but on the branches also. The cause is unknown. The 
trees are worthless and should be removed. 
AAR R: 
Medan, April 1917. 
