224 Neue Literatur. 33,2. 



Smith, G. F. H. , Description of an apparatus for prepäring tbin-sections 



of rocks (Mineral. Magazin vol. 16, 1913, p. 317 — 325 w. 2figg. ; vgl. 



diese Zeitschr. Bd. 33, 1916, p. 211). 

 Souza-Brandäo, V., Sur le microscope universel, un nouveau modele de 



microscope luineralogique (Communic. d. Serv. Geologico d. Portugal 



Bd. 10, 1914, p. 22—77 m. 1 Tfl. u. 5 Figg.). 

 Thomas, H. H., a. Campbell Smith, W., An apparatus for cutting cristal- 



plates and prisms (Mineral. Magazin vol. 17, 1914, p. 86 — 96). 

 Winchell, N. H., a. Winchell, A. N., Elements of optlcal mineralogy. An 



introduction to microscopic petrography (510 p. w. 350 figg. New- York 



1914). 

 Wright , P. E. , The determination of the relative refringence of mineral 



grains under the petrographic microscope (Journ. of the Washington 



Acad. of Science vol. 4, 1914, p. 389—392). 

 Wright, F. E. , The accurate measurement of the refractive indicea of 



minute cristal grains under the petrographic microscope (Journ. of the 



Washington Acad. of Science vol. 5, 1915, p. 101 — 107). 

 Wright, F. E., Microscopical petrography from the quantitative viewpoint 



(Journ of Geology vol. 20, 1912, p. 481—501 ; vgl. diese Zeitschr. Bd. 33, 



1916, p. 211). 



Berichtigung. 



In dem Aufsatze von P. Mayer in Heft 1 (Bd. 33) ist zu lesen: 

 S. 2 Zeile 2 von oben und Zeile 5 von unten Eugenol statt Eugenöl. 



