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S the amount of platinum, 0.0196, was too small to have an effect on tan 0, and also the cardinal component of base glass, such as MgO, ALO" and SiO "behaved themselves rather indifferent. On the contrary, LLO showed a strong influence, and the decrease of Li"O content seemed to be especially fovourable for the formation of /:l-spodumen and consequently the lowering of tan o. ( 3 ) Effect of additional components. The glasses of the base composition, Li20 4, MgO 15, AbO" 15, and Si02 62 by weight, and added by a small amount of any of the components, Na20, K"O, BeO, CaO, SrO, ZnO, CdO or PbO were melted and reheated at above 950°C. Among such second components PbO was the most effective, giving tano of 3-4)< 10--1 at 1 Mc at room temperaure with the addition of PbO: 0.045 mols to 104g of the base glass. Some Considerations on the Measuring Method of the Thixotropic Properties of Some Clay Slips Kaoru UMEYA Zairyo Shilwn (Journal of the Japan Society for Testing Materials), 10, 328 (1961) Two measuring methods are mainly used to obtain the thixotropic properties of clay slips. One of these is the method to measure the thixotropic properties by the stress decay, and the other is the hysteresis loop method. The author has already reported the results obtained through the stress decay method, and here in this paper, the results gained from the hysteresis loop method are reported. The results obtained by this method indicate that ( 1) the hysteresis area, that is, thixotropic behavior, of the caly slips, decreases exponentially with the increase of the water content, (2) the hysteresis area, also, decreases exponentially with the increase of the amount of deflocculant quantity. The thixotropic levels are decided by the method of the stress decay, and the degrees of thixotropic behavior may be obtained by the hysteresis loops, and yet no distinct relation has been found so far between the thixotropic levels and degrees of thixotropy. In this paper, we obtain the conversing constant between the two quantities experimentally, and the conversing constant are decided using several clay slips.