As for school textbooks of science, we investigated the characteristics of their structures, depending on inquiry of objective distributions about the following items. (1) the number of nouns/1000 characters (2) the number of technical terms/1000 characters (3) the length of sentence (4) the number of paragraphs/1000 characters The science textbooks that we have analyzed are those in the 'Seikatsu Rika' days at the present time and from the fifth to the sixth grade, Consequentry, in the first place, we have obtained the following results about the distributions. Those of item (1) are normal distributions. Those of item (2) are Polya-Eggenberger distributions having weak- transmission's character rather than Poisson distributions being derived from random distri- bution. Those of item (3) are Earlang distributions rather than logarithm-normal distributions. Those of item (4) are Poisson distributions. Secondly, about comparison between the science textbooks at the present time and those in the 'Seikatsu Rika' days, we have obtained the following results. As to item (1), the ones are more frequent than the others. As to item (2), the one of the fifth grade is most frequent than the others and as to transmission coefficient also, the same result has been obtained. As to item (3), the ones are shorter than the others. As to item (4), the ones are more frequent than the others.
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