Since the material of knots is perishable and can not be found preserved inrelic or fossil forms, research in its development is very difficult. The auth or has adopted the following methods :
(1) Marks remaining on earthenware ("Jõmon" potter) or hole in ancie ntpottery, stone and ivory implements whose age is clearly established, has be enclosely studied, and whose origin can thus be indirectly determined.
(2) Investigation of various kinds of knotting techniques employed by children between the ages of three and seven in various parts of Japan and statistically conjecturing the development and sequence of the various techniques based upon these data (cf. Jap. Journ. of Ethnol. Vol. 18, No. 3, 1954).
(3) To gather all varieties of knotting used by uncivilized peoples and to calculate the frequency of usage for each knotting technique in relation to the relative level or attainment of civilization. This will give information as to how the knots have been developed, and the sequence of development.
A combination of the results obtained by the three methods explained above, should yield some conclusions. In this paper the author has employed the third method and has attempted to interpret development on this basis.
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