170 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
excrescences, where it is crossed by some obsolete lines 
radiating towards the circumference. The heart wood exhibits 
the centre of growth to be very eccentric, and the zones of 
growth very unequal and much disturbed on the side A by the 
excrescence there, and a second centre of growth which has been 
formed between the original centre and the circumference. The 
excrescence B is much more elevated than the one at A, and has 
the appearance of the heart wood penetrating it by two conical 
projections. 
B 
No. 1.—One quarter the natural size. 
In drawing No. 2 the disease is well shown on the branches 
of the tree, and is drawn to half the natural size. It will be 
observed that the excrescences have now become very irregular in 
shape and size, in some places forming long confluent masses, 
which are transversely ribbed, and, although so various in size 
yet the excrescences are well distributed over the whole. 
