The London, Edinburgh and Dublin philosophical magazine and journal of science . n d. k. Acad, der Wissensch. zu Berlin, 1865. Prof. Miller on the Forms of some Compounds of Thallium, 153 It will be seen from the foregoing Table that Kopps values arelower than the others ; and bearing in mind that the coefficient ofexpansion of mercury, when deduced by means of these, falls belowthat obtained by Regnault, but when deduced from Despretzs ormy own agrees closely with Regnaults, we are led to conclude thatKopps values must be somewhat incorrect. On the Forms of some Compounds of Thallium. By W. H
The London, Edinburgh and Dublin philosophical magazine and journal of science . n d. k. Acad, der Wissensch. zu Berlin, 1865. Prof. Miller on the Forms of some Compounds of Thallium, 153 It will be seen from the foregoing Table that Kopps values arelower than the others ; and bearing in mind that the coefficient ofexpansion of mercury, when deduced by means of these, falls belowthat obtained by Regnault, but when deduced from Despretzs ormy own agrees closely with Regnaults, we are led to conclude thatKopps values must be somewhat incorrect. On the Forms of some Compounds of Thallium. By W. , , For. Sec. , Professor of Mineralogy in the Uni-versity of Cambridge. Nitrate of Thallium,Prismatic, 0 I 0, 0 1 1=38° 8-l ; 1 00, 1 1 0 = 62° 563. 1 0 0, 0 1 1LOO, 1 101 0 0, 2 1 01 0 0, 1 1 11 0 0, 2 1 1I 1 0, 1 1 101 1, Oil 0 1 1, 21 1 1 1 0,1 1 0 2 1 0, 2 1 12 1 0, 2 1 0 0 1 1, 1 1 1 1 1 I, Tl 11 1 1, 1 I 11 1 1,11121 1, 21 121 1, 2ll21 1, 2l I 90 062 56-344 2368 6-551 1334 575 103 4438 4754 7428 46 91 1421 53-543 4793 44-8 110 577 3475 38 122 28 Fig. I. Observed combinations :—1 0 0, 1 1 1 ; 10 0, 111, 211; 10 0,Oil, 111, 211; 10 0, 110, 2 10, 111, 2 11; 10 0, 0 11,1 10, 2 10, 1 1 1, 2 1 1. No cleavage observable. From the observed minimum deviation of the brightest part ofthe solar spectrum formed by refraction through the faces 10 0,1 1 0, it appears that the index of refraction of a ray in the plane0 01, and polarized in that plane, is about 1*817. The refrangibi-lity of the other ray is greater, its minimum deviation through thesame faces being 93° nearly. 154 Royal Society. Sulphocyanide of Thallium. Pyramidal, 0 01, 10 1=38° 20*3. Observed forms:—1 0 0, 1 1 0, 1 0 1. Fig. 2.
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