On the Effect of Tentperature upon the Crystal StrEtcture of Calcete. Chuji TSUBOI. The effect was studied by examining the Laue photographs of a crystal of calcite taken at high temperatures. On heating the crystal, the relative intensity of reflection from (122) as well as from (142) decreases, while that from (100) increases. On the other hand, E. Nies found that the intensity of reflection from (311) of calcite at the temperature of liquid air is so remarkably stronger than at ordinary temperature that neither Debye's theory nor Waller's can account for the difference. The present writer attributes all of these changes in the intensity of reflection to the change in the mean relative positions of the atoms that compose the crystal. It is then concluded that (1) the value of the parameter of oxygen aoms in the crystal at ordinary temperature is a little less than 0.25, and that (2) the Value of the parameter decreases as the temperature is raised. The bearing of the temperature effect to the crystal ana- lysis in general is discused, and a means for the precise determinatiem of the value of the parameter is proposed

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