1896.] Mineralogy and Crystallography. 813 
Miscellaneous Notes.—Von Zeynek’ notes the occurrence of 
sulphur deposited in the canals carrying 1,000,000 gallons of water per 
day from the hot springs at Warasdin-Téplitz in Croatia.—Rohrer® 
gives results of two very careful analyses of hematite from Elba. The 
average of the two is as follows: SiO, .49, Fe,O, 98.60, CaO .42, MgO 
.74, total 100.25.—In an article on the contact of minerals of the Ad- 
amello Group of mountains in South Tyrol, Salomon’ gives a detailed 
discussion of the Wernerite from Breno, with much of the literature 
relating to that mineral—Dupare and Stroesco” have recorded the re- 
sults of their observations on the crystalline form and optical behavior 
of thymoquinone and eleven of its derivatives——Gentil" describes the 
occurrence of large bundles of yellowish-white somewhat altered silli- 
manite needles in pegmatite from Algeria. Veins of albite and plates 
of muscovite are also mentioned. The same author” makes a note of 
thomsonite, stilbite and analcite from an altered basic volcanic rock 
occurring near Dellys in the province of Algiers.—De Gramont” is led 
by the observation of the electric spark between fragments of certain 
minerals which are good conductors of electricity, to astudy of the spectra 
of the sparks thus produced. This method promises to be useful for the 
rapid determination of certain minerals, and for the detection of in- 
cluded substances which are present only in traces. The lines of the 
non-metallic, as well as of the metallic elements may be observed. 
De Gramont also describes the apparatus used by him, and gives the 
details concerning the spectra obtained from air from twenty-four of 
the elements, and from about a hundred minerals.—Termier™ calls at- 
tention to the two forms of the dimorphous substance PbO. r dis- 
cussing the optical and crystallographic properties of the orthorhombic 
modification, he shows that its crystals are grouped to imitate a higher 
symmetry. PbO is, therefore, a good example of a substance which 
not only shows pseudo-symmetry by the grouping of the separate crys- 
tals, but also appears in a second form in which the molecular grouping 
follows an allied higher symmetry.—Gonnard,” in an article on French 
*Tscherm. Mitth., XV, p. 192, 1895. 
* Tscherm. Mitth., XV, pp. 184-187, 1895. 
*Tscherm. Mitth., XV, pp. 159-183, 1895. 
1 Bull. Soc. Fr. Min., XVIII, pp. 126-141, 1895. 
" Bull. Soe. Fr, Min, XVIII, pp. 170-171, 1895. 
"2 L, c., p. 374. 
8 Bull. Soc. Fr. Min., XVIII, pp. 173-373, 1895. 
“" Bull. Soc. Fr. Min., XVIII, pp. 376-380, 1895. 
16 Bull. Soc. Fr. Min., XVIII, pp. 382--390, 1895. 
57 
