255 
The actual yield of the half herring-bone trees (Ex. XJ was 35 n 
ozs. for 24 times tapped, the difference being added by computation. 
I his group of trees was tapped on three occasions during IW with 
the following result : — 
TABLE 7. 
No. of trees No. of times 
Method of 
Total filuid 
tapped. tapped. 
tapping. 
ozs obtained. 
90 
34 
* Basal 
24 LI 
~ 
90 
34 
* Basal 
12 61 
s Without added 
# water 
90 
24 
Half ] 
Herring* ,> 
bone. j 
35 11 
including water. 
It should be pointed out that on both occasions of the basal tap- 
pings there was no water in the collecting cups as the latex was 
required for curing by smoke. Compared with the half herring-bone 
tapping the latter was plus added water and both basal tappings 
minus water and the further loss, at least measurable loss, of clotted 
latex which always occurs (with young trees) unless the latex drips 
in a small portion of water. It emphasises the fact however that a 
half herring-bone tapping can follow basal tippings with advantage. 
There is also a still further advantage in first tapping young trees 
by basal excisions in respect of uniform bark recovery. As a con- 
sequence of a vertical channel with herring-bone excisions the re- 
newed bark is occasionally turgid, sometimes suppressed buds appear, 
while — so far as we have observed— this does not occur with trees 
first tapped at the base for the reason, we suspect, of the new bark grow- 
ing upwards or downwards only while bark tension has been relieved. 
It is sometimes stated that in bark renewal the new bark grows 
best, if not entirely, in a downward direction. It is not what actually 
occurs and if an excision of one, two, or more, inches wide is left 
intact for a sufficiently long psriod it will be found that the line of 
union between the downward and upward bark is in the centre of the 
excision. When, however, the tappings of the bark is being excised 
for a long period and the downward bark has commenced growing, 
the line of union will be below the centre, but the upward growing 
bark continues— as well as the two sides of the vertical channel in 
the double herring-bone tapping — towards the vertical— with the 
result that the renewed bark is turgid and frequently accompanied 
with various protuberances. 
