Indian Forest Records < [Vol. VI 
has been read off. The method is explained fully in 
Forest Bulletin No. 30. The girth-measurements have 
been carefully scrutinized and those which for any reason 
appeared to be unreliable have been omitted, so that the 
figures published may be held to represent fairly the rate 
of growth in the locality under existing conditions ; their 
value as an average should be checked by a reference to 
the number of measurements upon which they are based, 
to the period for which the measurements have been main¬ 
tained, as well as to the girth-class comprising the majority 
of the trees in the plot; where most of the trees are 
over 3 ft. in girth, figures for smaller trees are likely to 
show too slow a rate of growth, although measurements 
of trees which have suffered obviously from suppression 
have been rejected. 
(II) Outturn registers of individual trees maintained by 
divisional officers. After classification into girth-classes, 
averages have been calculated for each coupe. The yield 
of each tree is entered in the register by a clerk on the spot 
as conversion is effected. Little supervision is possible, 
and the accuracy of the entries for any single tree or even 
for a whole coupe is open to question. But the averages 
for the different coupes check each other, and on the whole 
they yield an approximate estimate of the outturn under 
present conditions. The Yield Table for Deodar in Kulu 
Division has been prepared entirely by Mr. C. G. Trevor 
who has kindly given permission for its publication in this 
record. 
(III) Sample plots established and maintained by the Silvicul¬ 
turist. The first plots were laid out in 1910-11 and their 
re-measurement was carried out in 1915-16. Fresh plots 
have been formed annually since 1910-11 and re-measure¬ 
ments are to be made at intervals of five years, so that 
every year certain plots will fall due. It is submitted 
that the results now published can be considered as only 
roughly approximate, but they will become more accurate 
with future quinquennial re-measurements. Figures for 
height-increment are not published because the measure¬ 
ments which have been taken are not numerous enough 
nor is the period over which measurements have been 
taken sufficiently prolonged as yet to yield reliable 
results. In course of time the average height measure* 
ments in the sample plots ought to give a fairly 
dependable height-increment. 
(IV) Miscellaneous investigations by officers acting independently. 
Mr. C. G. Trevor’s Yield Table for Deodar summarizes 
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