Silicon and carbon both belonging to
the fourth group in the Periodic Table
show similar chemical reactivity in many
respects. Both are able to form a series of
covalently bonded compounds, the bonds
being directed towards the corners of a
regular tetrahedron. DIMENSIONAL STABILIZATION OF WOOD
BY CHLOROSILANATION Silanes, corresponding to alkanes in
organic chemistry, have an empirical formula, Sin H2n-|-2O Each of the hydrogens
in the silane molecule may be substitute dby an electrophilic group, e. g., halogen or
by methyl groups. The properties of the organochlorosilanes are dependent on the

Programmes for extensive plantation
forestry have been taken by the Government
of Bangladesh to sustain the
adequate supply of forest products and to
maintain a balanced ecological condition
of the country. Large numbers of healthy
seedlings arc required for successful plantation
programme. Among the various
factors which threaten the production of
healthy seedlings, diseases play an important
role. Complaints regarding damage
of seedlings in the nursery by various
diseases are quite frequent. The present
investigation had been undertaken to study
the seedling diseases of eight tree species

Garjan (D. turbinatus) thrives very well in the hill forests under Cox’s Bazar
forest division. It also grows well in thE forests under Chittagong Hill Tracts,
Chittagong and Sylhet forest divisions. Uptill now Garjan has been extracted from
only the natural forests.