Abstract
Correlations between the yield of rice-crop in Hokkaidô and the winter temperatures at Nemuro and Dutch Harbour (year 1892-1919) have already been published in the Memoirs of the Imperial Marine Observatory (Vol. 1. 1922-24) by Prof. T. Okada. The present note is merely the continuation of his study; we have plotted the mean of the mean air temperatures in January, February and March at Nemuro and that at Dutch Harbour and the yield of ricecrop in Hokkaidô for the 11 years from 1920 to 1930. Then we calculated the correlation coefficients and probable errors of both quantities between the year 1892 to 1930 and arrived at just the same conclusion formerly attained by Prof. T. Okada.
Now it is affirmed that rice-crop in Hokkaidô may be foreshadowed by using the winter temperatures at Nemuro and Dutch Harbour.
