indigo ground and partly old vegetable gardens which had become 
overgrown with scrub. Several vacancies have occurred and on 
the other hand many seedlings have crept in, but taking the lot 
as a whole (excepting the original trees) they may be said to be 
from 19 to 20 years old, although from close planting and natural 
seedlings which have helped to park the ground, many of the 
inside trees have remained almost stationary in growth for some 
years. Under these circumstances we have endeavoured to illus- 
trate the yield of trees by a convenient unit of standard which 
shows the ratio of yield to every inch of girth as measured at 
3 feet from the ground. As a matter of fact, the yield per acre for 
a stated age, although a' natural question, is a difficult one. Trees 
of the same age vary considerably and depend on many conditions. 
The material point Is What is the average girth? then the yield 
can be calculated fairly approximately. 
It should be further stated that these experiments are likely 
to be continued over several years and many points not touched 
on in this report have not been overlooked but crowded out in the 
first year’s work. 
At the outset, a census of nearly all the trees of or about 
bearing age was made and altogether 1,285 trees were registered, 
showing age, girth at 3 feet from ground, whether previously 
tapped or not, and description of habit of the tree. This register 
is now important as shewing the annual increment of growth, and 
the result of annual tappings of the same trees. 
From the register, groups of trees were selected according to 
girth — from 1 ft. 6 in. to 5 or 6 ft., these were arranged into groups, 
and tapped by different methods and intervals during several 
months of the year, and the results recorded. Trial tappings 
were made in the months of March, April, May and June but we 
were not satisfied with the consistency or flow of latex and a 
definite start was deferred until July. 
The arrangement of the different groups for experiment, 
methods and periods of tapping, dry rubber obtained, and other 
details, are best shewn in the following summarized tabulated 
statements, details of which have been already published in the 
Agricultural Bulletin , S. S. and for September and 
November, 1904, and April and May, 1905, (^*Appendicesz3. B., 
C. and D.). We pause to mention that in these experiments, the 
comparative yield only, by dij/erent methods of tapping, was 
attempted and not the maximum yield. 
* Not printed. 
