At the present moment on lig nin studies, there is general ground for the view that lignin consists of the heterogenous compounds. But, there is a little studied on the distribution on the molecular weight. This experiment was for the purpose of researching on the distribution of these molecular weight of lignins that isolated by the various methods. Alcohol and phenol lignins isolated from cryptomeria wood, were separated many fractions by the fractional precipitation and the dissolution methods and measured on the molecuar weight and methoxyl group of these fractions. It has been shown by this experimental result that the compositi on of lignin is representable the heterogenous compounds by (C6?C3) and the range of its molecular weight is from 400 to 1,500. The fact that the position of the maximum points to the weight distribution curves have been sliped by the kinds of lignins, could understood from the integral calculus and the weight distribtution curves to the molecular weight of all fractional parts.
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