94 REPORTS ON INVESTIGATIONS AND PROJECTS. 



(3) Die Rolle des Wassers im Tremolit und gewissen anderen Mineralien. E. T. Allen 



und J. K. Clement. Z. anorg. Cheni. 68, 317. 1910. 



A German translation of "The role of water in tremolite and certain other 

 minerals" (Am. J. Sci. (4) 26, loi, 1908). Reviewed in Year Book No. 7, 

 p. lOI. 



(4) Quarz als geologisches Thermometer. Fred. Eugene Wright und Esper S. Larsen. 



Z. anorg. Chem. 68, 338. 1910. 



A German translation of "Quartz as a geologic thermometer" (Am. J. Sci. 

 (4), 27, 421, 1909). Reviewed in Year Book No. 8, p. 103. 



(5) Die binaren Systeme von Tonerde mit Kieselsaure, Kalk, und Magnesia. E. S. 



Shepherd und G. A. Rankin ; nebst optischen Untersuchungen von Fred. 

 Eugene Wright. Z. anorg. Chem. 68, 370. 1910. 



A German translation of "The binary systems of alumina with silica, lime, 

 and magnesia" (x\m. J. Sci. (4), 28, 293, 1909). In this translation certain 

 minor changes have been made in the text in consequence of later experi- 

 mental work and all temperatures are expressed in terms of the new Day 

 and Sosman high-temperature scale (1910). The original paper is reviewed 

 in Year Book No. 8, p. 104, the temperature scale in Year Book No. 9, p. 93. 



(6) Die genaue Bestimmung von Schwefel in Pyrit und Markasit. E. T. Allen und 



John Johnston. Z. anorg. Chem. 69, 102. 1910. 



A German translation of "The exact determination of sulphur in pyrite 

 and marcasite" (J. Ind. Eng. Chem., 2, i, 1910). Reviewed in Year Book 

 No. 9, p. 97. 



(7) The transmission of light through transparent inactive crystal plates, with special 



reference to observations in convergent polarized light. Fred. Eugene Wright. 

 Am. J. Sci. (4), 31, 157. 1911. 



Reviewed in Year Book No. 9, p. 100. 



(8) Schmelzpunktsbestimmungen. Walter P. White. Z. anorg. Chem. 69, 305. 1911. 



A German translation of "Melting-point determination" (Am. J. Sci. (4) 

 28, 453, 1909) . Reviewed in Year Book No. 8, p. 106. 



(9) Schmelzpunktsmethoden bei hohen Temperaturen. Walter P. White. Z. anorg. 



Chem. 69, 331. 191 1. 



A German translation of "Melting-point methods at high temperatures" 

 (Am. J. Sci. (4), 28, 474, 1909). Reviewed in Year Book No. 8, p. 104. 



(10) The melting points of minerals in the light of recent investigations on the gas 



thermometer. Arthur L. Day and Robert B. Sosman. Am. J. Sci. (4) 31, 341. 

 1911. 



When the work of the Geophysical Laboratory was begun, no tempera- 

 tures above 1150° C. had ever been accurately measured with the nitrogen 

 thermometer. It had been the custom of the Reichsanstalt to interpret the 

 readings of a thermo-element above 1150° by first calculating the curve of 

 temperature and thermal electromotive force of the element for the region 

 between 400° and 1150°, and then extrapolating this curve. The fixed tem- 

 peratures commonly printed on high-temperature measuring devices, like 

 the Siemens and Halske direct-reading galvanometers, are based on this 

 extrapolation. 



The absolute accuracy of the Reichsanstalt scale (400° to 1150°) was 

 estimated to be about 3° at 1150°, and the extrapolation above 1150° with 



