The bear lands of Japan are distributed not in mountainous regions but at hillsides of populated lowlands. The cause of this may be attributed to gathering grass and fallen leaves, especially to digging pine stubs which had been main fuel for light.
In Japan at the 16th century the production of commodities increased very much in quantity, and their market extended. As a result peasants u ere compelled to do handicraftic side-lines at night under the light of pine stub.
This change of existence condition expanded both eastward and westward front Kyoto-Osaka district, the economic centre of Japan at that time. Along with this progress, great many pine stubs were Jigged and the area of bear land increased exceedingly. (Fig. 1)
Now those reserved documents that prove the process above mentioned are available. The relation between these two is demonstrated by Spearman's coefficient of rank correlation. r=0.99.
