Аннотация:The three wood species were found by combustion analysis and combined wet-dry ashing to have an essen tially constant molecular composition, represented approximately by C^H^Og.Continued works should be directed to investigations with a 12 12 source of neutrons with energies below the C(n,n') C* threshold and also to a source with esse n tia lly a ll neutrons i n it i a l l y above the threshold.Both experimental studies would benefit greatly from a d etailed mathematical analysis based on computerized neutron-shielding codes.