FORMATION OF NODULES. 
28 a 
with the stem wood, but continue a process of growth, 
which results in the production of globular shoots lying 
isolated in the cortex. These bodies vary from the smallest 
size up to 3 or 4 centimetres diameter, and may be single, or 
several may be fused together in a horizontal row along the 
leaf-scar. Globular shoots have been obtained from the 
cortex of seven-year old trees ; hence the rate of development 
appears to be much more rapid in Hevea than in the beech, 
where similar bodies are found. 
(2) Material collected from Areas where the Bark 
exhibited no External Marks. 
This material agreed with the leaf -scar material ; in fact, 
it is highly probable that it should be considered as leaf-scar 
material, the leaf-scars having disappeared in the older bark 
from which this was obtained. Cases occurred where the 
globular shoots had fused together in a horizontal row, 
exactly as in the case of leaf-scars. 
Two specimens were obtained which showed a deposit of 
tannin in scattered cells in the centre. This unusual secretion 
of tannin may have been due to conditions present before the 
latent bud had resumed activity resulting in the formation of 
a globular shoot. The tannin content was light coloured and 
readily turned blue with ferrous sulphate solution. 
These first two classes of material comprised nearly the 
whole of the collection from the 2,000 trees. 
(3) Material collected from Wound Callus, 
Only seven specimens were obtained, and these were 
typical globular shoots save one, which was considerably 
elongated. 
(4) Material collected from the Fork of Trees 
with forked Stems. 
A few globular shoots were obtained which resembled in all 
respects leaf -scar and wound-callus material. 
Trees are frequently seen which have been blown over by 
the wind or have otherwise been caused to fall ; they may have 
only a few lateral roots still in the ground, yet along the whole 
