The author delivered a short history of the lighting in China and daily life of her inhabitants seen from the stand point of lighting.
The lanterns, of paper and of glass, add red colored candles, large and small, were demonstrated. The author showed a pair of quartz balls which emit faint light when they are rubbed with each other by hand. The festival cups are sometimes: of the same kind and are called “luminous cups”.

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This is a report of a part of the life test of the heating wires at the temp. 1200°C. The specimens used are the wires for lower temperature use made in Japan and other countries.
The tests are carried on under the conditions, one at the const. temp. 1200°C, and the other at the coast. voltage which corresponds to the initial temp. 1200°C of each specimen.
The specimens of 30cm length are stretched parallel between terminals and the temp. are varied by the adjustment of the series resistances. The terminal voltage and the current of each specimen corresponding to the temp. from 700°C to 1200°C are measured after 50°C steps.
From this volt-temp. curve the proper terminal voltage for 1200°C temp. rise is determined. In the life test of the second condition, the applied voltage is kept at constant adjusting the series resistance with the period of one hour. At each time of adjustment of the potential, the temp. and the current are measured.
The change of the current is proportional to the change of the consumed power, and from this value of current and the temp. the useful life of the specimen can be determined.
In this test the temperature is measured by the Siemens type optical pyrometer which is accurate within one percen E. at 1000°C.
The emf is applied continuously above 5 hours a day and then cut out till next morning.
When any hot spot is appeared its temp. is also measured.
From this test it may be concluded that
(1) The life of the heating wire depends on the uniformity of the diameter.
(2) The heating wire of the hard oxidation film has the longer life than that of the weak oxidation film.
(3) The life does not depend on the amount of the oxidation only, but also on the other factors such as the chemical and physical constructions of the specimen.
(4) The wires made in Japan have the longer lives than the imported wires.

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The statistics of electric incandescent lamps used in Japan in 1926 are shown and compared with those of the past ten years.
Carbon lamps for the lighting purpose almost disappeared from the market and were only 0.01% of tolal lotal lamps used in 1926.
The size used become larger and larger: about 29% of total lamps used are those larger than 20 cp lamp.
The degree of popularzation of electric lamps also shows the tendency of making rapid progress.
Similar statiscs are taken for six largest cities in our country.
The tables and diagrams may be consulted as they are explained in English.

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This paper is a briefdiscussion on Nomen relates the necessity of Symbols. dature and Definitions in which the author

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