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mon on severely tapped trees but is not confined to the tapped area 
and is sometimes met with an untapped tree. Do you know the 
Section of stem h 
Cambium 1 - 
Cork in bark 1 * 
* cause, and what will be the ultimate fate of these growths, will they 
cut themselves out by growth of cambium, or will they continue 
to spread indefinitely? Some I have tried to cut out and find them 
seven or eight inches long and wide in proportion. 
They appear to commence as small globules of wood inside the 
bark, with a spur point piercing the true caijibium and in contact 
with the wood of the tree — thus. 
Cork j- 
Cambium — _}. 
Are they dangerous to the welfare of the tree and if so, should 
they be excised wherever seen beginning. Tapping has been done 
with the help of the pricker, do you think that the pricker, by 
chipping off and leaving small fragments of wood surrounded by 
cambium, could start these unpleasant growths. 
1 should be very glad if you can tell me anything about this, and 
whether other places have had trouble with the .same thing. There 
