Th© lack of knowledge of treatability of timber species with
pressure method may result in poor treatment in reipect of penetration
and retention of the preservative chemical Inwood. This knowledge
for our indigenous timber species was not ascertained before. The
relative penetrability of nineteen timber species was, therefore,
determined with Lowry empty cell process using 40 r 60 creosote
and light diesel oil mixture.
Specific gravity of species did not seem to have any bearing
on the penetration cf preservative. Grain structure and presence of
tyloses appeared to be correlated with penetrability of the wood.
The species were classified into four treatability groups according
to the degree of heartwood penetrability.

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Paper pulps have been prepared from Gamar (Gmelina arborea, Roxb.)
wood of four age groups by the kraft process. Cooks were made with
active alkali and sulfidity ranging from 14,94 percent to 21.05 percent
and 14,12 percent to 20,12 percent respectively at 170° C, The best
pulp was obtained with 16 years old gamar wood at 14,94 percent
active alkali and 14,57 percent sulfidity under optimum condition.
Pulp-yield varied from 40,86 percent to 49,35 perecnt at various ages.
The physical strength and other properties of Gamar kraft pulp compared
favourably with those of other hardwood pulps prepared in the Forest
Research Institute, Chittagong,