459 
The Experiments Reviewed 
Notes. 
Experiment I. 
From August, 1905 to July, 1906 or a period of one year, three- 
tappings have been carried out, making a total number of 72 days-' 
cr incisions resulting in 134 lbs. 2 oz. of dry rubber or an average 
of nearly 2 lbs. 1 1 oz. per tree. If to this is added 30 % for scrap 
and clot (which may vary from 25 % to 4o%)'the average per 
tree is about 3! lbs. The tappings include one evening period 
and it may be noticed that the ratio of caoutchouc to latex for the 
second period or evening tappings is better, than the first or 
morning tappings although the interval of rest was only 2 \ months 
or slightly less. This result stands alone and indicates the neces- 
sity of experiments and observations over a long period. 
Experiment II. 
The interval of rest between the two periods of tappings was 
under months, the second comparing unfavourably with the 
first period and the evening poorer than the morning. The result 
is striking as the ratio of caoutchouc to latex in the second period 
is very low partly due to evening tapping but as may be seen the 
difference is more marked in respect of caoutchouc than latex, and 
it would appear that had the time been reversed the best flow 7 of 
latex would have been obtained by daily tapping instead of alter- 
nate days. The average yield per tree (with 30 % scrap, etc. 
added) is 2 lbs. 3! ozs. for two periods of tappings only, the second 
or last tappings being most probably marrtd by (a) insufficient 
interval of rest, {b) commencement of the wintering or dormant 
season of the trees. 
Experiment III. 
Exactly an interval of two months’ rest, which fuither emphasises 
the necessity of a longer period and the advantage cf morning ever 
evening tapping. Considering that these are small trees the first 
tapping may be described as satisfactory, and the flow of latex at 
the second tapping, fair, but the return of caoutchouc is remarkably 
poor and the average per tree is reduced and only amounts to 
1 lb. 5 ozs. 
Experiment IV. 
The variations of different groups is strikingly illustrated as 
shewn in the details of this experiment. The difference in yield 
of latex between the two perieds is only 803 czs. c/c and it is 
probable that had all the groups in the second \ cried of tappings 
been full herring-bone incisions instead cf single incisions the 
margin would have been much less, still the single incisions com- 
pare favourably with the full incisions, hut the ratio of caoutchouc 
is a considerable drop although an improvement on previous figures 
no doubt due to the longer rest — the interval being four months, 
and the average gross yield per tree is 2 lbs. 4! ozs. 
