REMARKS.

All

fall in Stems-1 1'-3' 3'-443-6 6

classes

inches.

up to 6.'

Level ground.

:

:

:

67.0

0'33 0'32 0'38

035

3'33

:

0'33 0°32 0'38 0.35

:

At this stage it is impossible to generalise or to deduce reliable conclusions from the figures given in the preceding statement. It is admitted that many of the sample plots have been badly chosen; measurements are in some cases inaccurate or, for obvious reasons, deceptive; and the trees have almost invariably developed under most abnormal conditions. But, even ignoring these blemishes, it is clear that each sample plot should be carefully and separately studied in order that the quality of the locality (soil, climate, spring-water level, etc.) and the effects of the sylvicultural treatment may be correctly gauged, and given their full value. The importance of such investigations is only too manifest. In the preparation of Indian Working-Plans, almost without exception, the rate of girth growth enters into the calculation of the possibility; and whilst an over-estimation of the mean annual girth increment will lead to over-exploitation, under-estimation by unnecessarily lengthening the rotation may cause serious financial loss.

Bearing these remarks in mind, it may be interesting to consider broadly and over large tracts, how far the data at present available give any indication as to the effect of the different factors of locality on the rate of girth growth, (excluding soil, which in itself is of the greatest importance). This will be facilitated by a reference to the following statement, which contains a summary by Forest Divisions of the preceding data.