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Published online by Cambridge University Press: 14 March 2018
In 1881-1882 Dr. A. Brotherus and his brother, A. H. Brotherus, made a botanical tour in Armenia and the Caucasus; the younger gentleman collected a few specimens of rocks met with during their journey, which, on his return, he kindly left to be examined by me.
This material consisted of later eruptive rocks; it was scanty, but as it was obtained in places from which we have no earlier information of a similar character, I have not thought it uncalled for to make in the following lines a slight contribution to our knowledge of the geognosy of the regions in question.
The microscopical analysis of rocks from the Caucasus made by Tsehermak, Lagorio, and Möhl relate in part to the identical rocks that I shall describe, but the localities are different.
page 155 note 1 Möhl, Kaukasische Oesteine, Natunoiss. Ges. Isis. Dresden, 1878.
page 155 note 2 Tschermak, Felsarten aus dem Kaukasus, Mill, Mitth. 1872, 2 Ileft, p. 107; and Min. Mith. 1875, p Heft. p. 131.
page 155 note 3 Lagorio A. Die Andesite des Kaukasus, Dorpat 1880,
page 157 note 1 Michel-Levy: De l'emploi dc Microscope Polarisant, Ann. des Mines, 1871.
page 157 note 2 Schuster: Optische Orientirung der Feldspathe, Tschermak's Min. Mitth. Bel. III 1880.