Part III. ] AVitt : Sylviculture of Hardwickia binata. 103 
(6) Volume Growth. 
(i) General . — We have found some difficulty in obtaining accurate 
statistics on this point, partly owing to the lack of information re- 
garding the ages of planted trees, and partly to the difficulty entailed in 
the ring counting of felled trees, the rings in only a small proportion 
of the trees examined being clearly visible. The figures here given must 
therefore be taken with some reservation, but we believe they will be 
found to approximate fairly closely to the true rate of growth. 
Data have been collected for growth on trap rock and on sandstone, 
as it was expected that a considerable difference would be found to exist 
in the rate of growth on the two formations. The fact that such is the 
case is borne out by the results obtained. 
{ii) Volume growth on tray rock . — Taking the growth on the trap 
rock first, and referring to the 45 trees planted in the Civil Station of 
Khandwa, and already mentioned under height growth, girth measure- 
ments at breast height gave an average radius of 4-05 inches for the 
45 trees, after deducting DO inch for the thickness of the bark. The 
age of these trees we have already put at 37 years, so that the rate 
of growth works out as nearly as possible to 9 rings per inch of 
radius, which is not so slow as we should have expected. 
(m) Volume growth on sandstone . — Coming now to the growth on 
sandstone the following table shows the results of ring countings of 10 
trees of various ages : — 
