故田久保教授が稀元素鉱物の研究に著手せられてから今日までに調査研究せられたものは夥しい数になつている。それらのうち既に発表せられている論文は卷頭に挙けられてある如く20数編に及んでいる。ここに最近数年間において研究せられた稀元素鉱物の薪産地を紹介して鉱物採集の案内に供する次第である。

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The tea industry of Japan, which is one of the most important export industries, developed with the commencement of export at 1859. The development of export of tea was accompanied by the increase of tea production. The tea export marked the maximum at 1891, that was about 53, 000, 000 ponds, and the after the year, export decreased gradually. The areas of tea gardens also came to its maximum at 1885, that was 60, 000 hectares, and it decreased after the year, and the production of tea were concentrated upon some areas gradually. Thus, tea producing areas have been formed. That are Shizuoka Pref., Mie Pref., Kyoto Pref. and others.
The concentrated areas of tea production are divided into two types in relation to their tea producing systems.
(I) Area, in which tea farmers growing tea gardens and manufacturing tea by themselves, are dominant.
(II) Area, in which tea farmers are differentiated two types, i.e., raw leaf seller, and manufacturer mainly depending upon buying tea leaves.
The area belonging to type (I) are found in the mountains of the Ooi and Abe Basins in the Shizuoka Pref., typically. The area belonging to Type (II) develope on the diluvial uplands, such as Makino-hara area in Shizuoka Pref.
Writer discussed some conditions of the formation of the areas of these types.

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The intent of the present article is to analyze "histories" compiled by each regiment in the Japanese army from the Russo through the Sino-Japanese wars, concluding that such works were nothing the Sino-Japanese wars, concluding that such works were nothing but attempts to praise "the heroic past" and provide a means to instill such a consciousness in both the troops and society in general.The historical remembrances of the Russo-Japanese conflict were more and more emphasized with the outbreak of the First World War and the anti-war and anti-militarization movement that accompanied it.The descriptions of those who had died in past conflict were intended to stir the emotions of the troops and provide a route by which to legitimized "dying forons's country".Even on the local level during that time, "memorials to veterans" of both wars were compiled with the similar intention of establishing a forum upon which to instill a common sentiment about the viewpoints and logic of the military within local society.After the outbreak of the Manchurian Incident, "regimental histories" took on two distinct forms.The first consisted of memoirs concerning the victorious history of the Russo-and Sino-Japanese Wars, which in addition to insisting upon Japan's legitimate claim to Manchuria, tried to prove that even the Japanese people, who had not really experienced a genuine war since the Russo-Japanese conflict and had become used to peace, could indeed win another full-scale war, thus playing a role in attempts to instill"definite behavior patterns" and encourage the country's fighting spirit.The second contained contemporary regiment-by-regiment accounts of the Manchurina Incident told from the personal views of individual combatants with the intention of verifying the regiment's consciousness concerning the Incident, encouraging further sacrifices for the cause, and appsaling to society at large.The veteran memorial literature published on the local level at that time were compiled with a similar intent in mind, attempting like during World War I to instill military ideals and persuasive logic into society at large.

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Zircon is one of the most common and familiar minerals which are distributed widely in various rocks. Therefore the mineralogical characters of zircon have attracted the interest of geologists, petrologists and mineralogists and have been investigated from various stand points of geology. Some of these characters are very intimately related to the content of radioactive elements, and this investigation was made as an attempt to account for these relationships.
The uranium contents of representative zircon specimens collected from the weathered granite sands of the Tensi Mine were analyzed by the microfluorimetric method. To eliminate the quenching effect of fluorescence intensity derived from the bluk zirconium, the actual contents were calibrated by multiplying the coefficient 1.31 to the apparent value determined by the direct method.
The radioactivity of zircon was measured by the decatron type countmeter, and it was generally proportional to the uranium content. The natural fluorescence intensity activated by the ultraviolet ray was determined by means of the sensitive photomultiplier detector, and the fluorescence intensity of zircon containing a comparatively large uranium was lower than that containing smaller amount.
An attempt to find some relation between the colour and the uranium content in zircon was fruitless except for the facts that the colorless zircon was relatively low in its radioactivity but that the greenish brown member was moderately high. The lattice defect of zircon was also investigated with the Geiger counter diffractometer and related to the uranium content.
Various minor elements contained in zircon were semiquantitatively determined by spectrographic method.
From the above experimental results, the intrusion of granite batholith was classified into three following stages, first the stage in which the first intrusion of granite represents the northern part of this district and the zircon content in granite is rich and the uranium content in zircon is small, and secondly the stage in which the second intrusion of granite represents the southern part and the zircon content is small and the uranium content is slightly richer than that of the granite found in the northern part, and finally the stage in which the third intrusion of granite represents the middle part and the zircon content is of moderate amount but the uranium content ranges from a small to a large amount.

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