Garjan (Dipterocarpus turbinatus Gaertn.
f.) is a lofty evergreen tree, attaining a
height of about 46 m and a girth of about
5 m, with a long clean cylindrical bole and
an elevated crown (Troup 1921). It is
indigenous to Bangladesh and is also
distributed throughout the greater part of
Indo-Malayan region (Troup 1921, Gamble
1922). In Bangladeshi Garjan occurs in
the gregarious type secondary Garjan
forests of Chittagong and Chittagong Hill
Tracts, bordering the Lushai and Khasia
Hills of Assam and North Arakan of Burma
(Champion at al 1965, Das 1980). In the
natural habitat of Garjan, temperature
varies from 4O.55°C to 15.55°C and the
rainfall varies from 152 cm to over 508
cm (Troup 1921, Gamble 1922, Lu 1972).