Abstract
The author reckoned the average weather elements during the sericultural season in Nagano prefecture, Japan. Comparing the results with the corresponding crops of cocoon, he explained the advantagious and disadvantagious effects of weather on the sericulture. He also calculated the correlation coefficients between the cocoon crops and the average weather elemnets during the sericultural season and obtained for years 1907-1920 the following fignres:-
