Part I.] 
Troup : Teak Forests of Burma. 
31 
timber yielded (columns 10 to 15), so far as totals for Divisions go, are 
accurate in that they are based on actual statements prepared at 
measuring stations : in some cases, however, they are not to be relied 
on so far as distribution among the different working circles is concerned, 
because the hammer marks denoting the forests from which the logs came 
are not always taken into consideration in classifying the timber at 
its destination. It should in any case be noted that these figures 
do not include logs lost in transit, and in some of the floating streams this 
loss is considerable. 
The figures relating to the number of trees felled (column 9) are not 
generally to be relied on, since they are as a rule based on the state¬ 
ments of wood-cutters. 
It will be seen, on a comparison between columns 7 and 8 of Appendix 
IV, that the yield has in the majority of cases been overestimated. 
Actuals compared This does not necessarily imply that the estimate 
With estimates. 0 f the number of marketable trees on the ground is 
estimate 1 ! 07 t0 ° Ver ' Wr0ng ; for in man 7 cases numbers of such trees 
have to be left unfelled for sylvicultural reasons, 
and as the number left depends largely on the idiosyncrasies of the girdling 
officer the number of trees actually girdled over a given area may vary 
considerably on that account alone. 
The fact, however, remains that the tendency has been to over¬ 
estimate the number of teak trees which maybe girdled during any sub¬ 
period. Strictly speaking the number of naturally dead trees should 
count against the yield. Where this is the case the estimate of 
trees to be felled is probably not too high in the majority of cases ; it is 
impossible, however, to be certain on this point, since, as mentioned 
above, the figures in column 9 are not to be relied on. 
The highest estimated yield per square mile* is in Mohnyin reserve, 
namely, an average of 45 trees of 7 feet girth per 
Yield per square mile, annum. In the two sub-periods already passed 
(l) Mohnyin reserve, through, however, only some 24 trees per square 
mile per annum have been actually girdled, though 
if we accept the figures for trees actually felled (colunm 9) the 1st sub¬ 
period shows an average yield of 43 trees per square mile per annum. 
It may be remarked that enumerations in this reserve were carried out by 
means of linear valuation surveys extending over only 5*9 per cent, of 
the total area, so that a high degree of accuracy could not be expected. 
* This means per square mile of total teak-bearing forest, 
actually worked over during the year. 
and not per square mile 
[31] 
