Bandarhola (Duabanga sonneratioides) heartwood was treated with 40 : 60 creosote petroleum oil mixture by the Lowry empty cell process using different schedules and the effects of varying pressure, treating time and final vacuum period on penetration and absorption were studied. This species, inspite of presence of tyloses in the vessels, was highly permeable to the preservative mostly along the grain. Transverse penetration from the surface was, however, low. The reason for higher permeability along the grain is attributed to the presence of numerous intervessel pits with perforated pit membranes. Increasing pressure and treating time increased penetration and absorption. At 82°C preservative temperature, saturation in absorption was reached in about 120 minutes. Final vacuum recovered about 25 per cent of the absorbed preservative, leaving the rest in the wood as net retention.

Loranthaceac includes semiparasitic plants which are known as mistletoes. In Bangladesh mistletoes attack a large number of hosts, viz., Gamar, Teak, Sal, Mango, Jackfruit and many ornamental plants. In the country 15 species under 7 genera of Loranthaceae have been recorded and their distribution have been discussed. The important hosts of mistletoes have been listed. A critical review on the biology and control of mistletoes has been presented. Attention has been drawn to generate adequate studies for appropriate control of the parasites in our context.

The applicability of kiln drying schedules developed earlier were verified for 5 cm thick planks of thirty indigenous hardwood species. A series of charges were kiln dried covering the entire specific gravity range under four classes. It was found that the kiln schedules developed earlier for thinner stocks were equally effective in drying thicker ones. Five cm thick planks of different species having similar Specific gravity range in different classes may, therefore, conveniently be kiln dried using the recommended schedules.

This paper considers forest inventory from mathematical points of view. Several text-book results have been proved mathematically. Also, a possible mathematical definition of time of felling of a tree has been suggested. Finally, using the results of this investigation, the mathematical model presented by Choudhury and Chowdhury (1983) has been examined and an alternative model has been proposed.

Kraft pulping of whole jute plant without retting was conducted in the laboratory scale. Compared with kraft pulping of bamboo, the unbleached pulp yield with unretted jute plant was lower by about 3.0 percent points at the same point of delignification. The yield was lower by 17.0 percent points compared to kraft pulping ofjute bast fibre. Jute plant pulp degraded severely on bleaching. However, the quality of unbleached pulp was almost similar to kraft bamboo pulp. Whole jute plant can thus replace bamboo in making papers which do not require bleaching.

During March-April, 1989 a sample survey was conducted on the attack by stcmborcr in the kcora (Sonneratia apetala) plantations of Chittagong, Noakhali, Barisal and Patuakhali Coastal Afforestation Divisions. The survey was made in the plantations established from 1967 to 1985 covering 76,624 ha land. The purpose of the survey was to estimate the overall intensity of infestation in different Coastal Afforestation Divisions as well as to establish relationships of the infestation will) some other parameters.

A point sampling method was followed for the survey. The results showed that stocking of kcora trees per hectare was 1645 of which 851 were
infested by stcmborcr. The overall infestation was estimated to be 52% with an average of 61%, 59%, 45% and 44%. in Barisal, Patuakhali, Noakhali and Chittagong Coastal Afforestation Divisions respectively. Intensity of infestation was graded into three groups, viz., slight, moderate and severe. Severely attacked portion showed the highest infestation (22%) compared to tiic slightly (13%) and moderately attacked trees (17%).

A number of qualitative characters, such as plantation composition, plantation age, canopy density and total inundation duration were studied
towards their degree of association with the infestation. Age of die plantations did not show any correlation with the intensity of infestation while inundation duration and plantation composition had significant effects on it.

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.

Flowering periodicity and seed germination of Bara bet, Calamus viminalis willd. var. fascicnlatiis Becc.; were studied. It was observed that this species flowers twice in a year i.e. from February to April and again from August to October. Seed ripens after 18 to 22 weeks of flowering. A single plant may yield 2-2.5 kg of fruits in each flowering. A single fruit, on the average, has a diameter of 0.92 cm and weighs o.4og. Seeds germinated after 10 to 18 weeks of sowing. An average of 10 and 26 percent seeds of the first (autumn) and the second (spring) phases of flowering respectively, germinated.