PLATE II {continued) 



Fig. 2. {a) X-ray diagram of wood from the 20th annual 



ring in a stem of Picca abies. Beam perpendicular to 



grain of wood. CuKa radiation. 



(,30 030^ (J. 3^^ 



4f- 



o 



(ioi}(ioT),(Ooa) 



■H- 



t^ 



Fig. 2. (6) Chart corresponding to fig. 2 (a), showing the indices of the planes 



which give rise to the various arcs. 



