Laue's original theory (1935) of Kikuchi patterns cannot explain the fact that whether the lines appear black or white depends upon the direction of the incident beam. Although he proposed a revised theory (1948), Laue did not obtain any conclusion which could be compared with experiment. The present author has developed Laue's revised theory and discusses such conclusions.

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The unindexed line which runs along the middle line of a Kikuchi band is explained in the case of the 200 band from magnesium oxide by the theory of Kikuchi patterns [Kainuma, Acta Cryst. (1955) 8, 247]. The intensity profile across the line is estimated without solving the equation of the dispersion surface, by using a matrix formulation of the many-beam dynamical theory. In the estimation, the 000, 200 and 400 reflexions of elastically scattered waves and the ~00, 000 and 200 reflexions of inelastically scattered waves are taken into account. The result of the calculation agrees qualitatively with the observation.