The Siberian High is of a relatively shallow vertical structure, whose excess of pressure is due to the excess of density in the lower troposphere. The North-Pacific High extends into the stratosphere, in which region it is colder than the normal for the latitude and the time of the year. General westerly winds prevailing over Japan and the west-east tendencies of barometric centres clearly show that the Siberian High is a cold anticyclone and the North-Pacific High is a warm one. The cold migratory anticyclones are mainly generated by the cold outbursts from the Siberian High brought southward in the rear of depressions and are amalgamated into the warm North-Pacific High.
In this paper the coefficients of correlation between the yield of potatoes and the weather factors (monthly mean temperature, monthly amount of rainfall and monthly total hours of sunshine in the cultivating period) have been calculated by the method previously reported in this magazine, for each prefecture of Japan. The correlation coefficients calculated are given in tables 1, 2, and 3. Indeed these values do not show sufficiently the relation between the yield of potatoes and the weather factors, but there are recognized the following facts. 1. In the Tõhoku and Hokkaidõ districts it is favourable for the yield of potatoes when the weather is warm at the early stage of growth, and warm, rainless and sunny at the tuber-setting time. 2. In the other districts than above-mentioned the relation is not similar for the prefectures.
The purpose of this study was to obersve experimentally the relation between the seasonal variation of the quantities of chlorophyll and carotinoid contained in the leaves of Quinara tricuspidata, Koehne and several meteorological factors during the period from autumnal tints to defoliation. Observations were made in sunny (S) and shady (D) places at the Central Meteorological Observatory in Tokyo. The method of extraction of pigments was the same as that of Willstätter-Stoll modified by Schertz, and a calorimetric method was employed. The results are as follows:- The quantity (S-D) of chlorophyll pigment is influenced by the rise and fall of temperature, amount of rainfall and the duration of sunshine, while that of carotinoid only by the temperature decrements.
In this paper it was intended to express the date of first flowering of cherry trees at meteorological stations in Japan and China by a linear equation: where y is the date of first flowering, ψ the latitude, λ the longitude and h the altitude of a station. Using the observed data, the values of the constants in the mathematical expression were computed for the flowering of Prunus yedoensis, Matsum. and Prunus serrulata, Lindl. var. spontanea, Mak. For the former species, For the latter, The results of computation are given in tables 1 and 2.
By means of the periodogram method and Takahasi's method we tried to find the periodicity of thunderstorm. The data which we have used are taken from the report on thunderstorms in Japan published by the Central Meteorological Observatory of Japan for the years 1933 to 1938. The result of the statistics shows that the periodicities of 14 and 21 days are remarkable, which are multiples of 7 days. Besides, 4, 5, 7, 9, 16, 18 and 27 days are rather doubtful. As is well known, periods based on 7 days are generally found in other meteorological phenomena in the conntry, and so we cannot insist these to be the proper periods of thunderstorm only.