Abstract
X-ray and electron diffraction diagrams of three softwoods (Larix leptolepis, Pseudotsuga mensiesii and Pi_??_s densiflora) and three hardwoods (Shoren sp., Zelkova serrata and Fraxinus ear, japoniea) which were previously delignified and/or hydrolyzed to various extent were recorded and resolved into characteristic reflections of cellulose I. The monoclinic angle of the controls determined by X-ray reflection showed significant differences between the two groups. These differences, however, became smaller with extending hydrolysis time posterior to delignification. On the contrary, by the electron diffraction there were insignificant diffrences between two groups. These observations suggest that the structural variations of cellulose crystal between softwoods and hardwoods stem from non-crystalline substances such as amorphous cellulose, hemicellulose and lignin which may connect intimately with cellulose crystals in the cell walls.
