Herein are briefly described the forms of the stage lighting equipments, and as a matter of course, various apparatuses used on stages are explained in the top of this article. Finally, the stage lighting ; are viewed from the standpoint of the “production” by classif ing into four pas ts, namely.
1. physiological lightings,
2. ealistic
3. aesthetical
4. expressional

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The photogalvanic cell was distiugnished from other sorts of the photo-cell as well as from photo-sensitive cells. A ogalvanic cell using silver iodide electrodes, formed by a new improved chemical method, was constructed. The cell, thus made, is highly light sensitive and almost perfectly reversible. The characteristics of the cell were thoroughly investigated by the author and Mr. T. Takebe, but only an outline of which was given in this lecture the details having bee : i appeared in the original report, cf. Jour. Chem. Soc. Tokyo (Now Jour. Chern. Soc. Japan.), 41 (1920), 77.
It was proved that using the cell in combination with a sensitive pointer galvanorneter very accurate photometric results were obtained. Moreover, using it with a recording galvanometer, e. g. a thread recording galvanorneter, etc., it is quite easy and suited to record a changing illumination, such as the change of day light throughout the whole day.
On request the photogalvanic cell with or without a suitable sensitive galvanorneter for the photometric use will be supplied from the works of the Institute of Physical and Chemical Research, Kornagome, Hongo, Tokyo. Illustrations are shown in this paper.

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Authors investigated the state of the methode and installation of the electric illumination in the interior, the front and the show-window of general selling shops exsisting in the commertial street of Tokyo, with the object of confirming the present actuality of shop illumination and approved that only 30 percent of investigated shop illuminated some good situation and the rest70 percent was rather defective.
The main reason of such results was standing on the use of either bare lamps without any moderating accessaries or the shallow type of shade screwing a large gas filled lamps.
For the relief of this condition, authors thought that it would be most important to realise the improvement of this department with the method of that store selling electric apparatus, electric lighting Co. and others relating to the illuminatingengineering should be stand on ahead of the general lighting power consumer as an adviser or a consultant.

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