192 
MR. C. BARRINGTON BROWN AND PROFESSOR J. W. JUDD 
of valuable monographs by Dathe* * * § ** * * §§ *** * * §§§ and J. Lehmann.! Their peculiar characters 
and their relations to the “ flaser-gabbros ” and other igneous masses which have been 
subjected to dynatno-metamorpliic action have been rendered familiar to all geologists 
by the writings of these authors. 
In Brittany, a compact rock of this class has long been known as furnishing 
materials for pre-historic weapons, and the characters and distribution of the pyroxene¬ 
bearing rocks in this area have in recent years been worked out by Whitman Cross, j 
Barrois,§ and Lacroix. j| 
In 1882 Professor F. Becke gave a very careful description of the peculiar 
characters of the pyroxene-gneisses of the Waldviertel district in Lower Austria,*" and 
pointed out the association of these with rocks containing scapolite and crystalline 
limestone. 
Rocks of the same kind have been known for some time in Scandinavia, and have been 
especially studied at Oedegarden and other localities near Bamle by Brogger and 
ReUSCH, ## TORNEBOHMjtt SJOGREN, and SvEDMARK.§§ 
On the North American continent, Adams and LAWSONj|j| have called attention to 
the rocks of the same mineralogical composition in Canada ; while their presence and 
wide range in the United States have been pointed out by Lacroix, fll Nason, ### 
and others. 
Areas composed of similar rocks have been described in Bavaria by Gumbel,+++ in the 
Pyrenees and Central France by Gouxard and Lacroix, JJJ in Spain by Calderon,§§§ 
in Algeria by Delage,|||||| off the West Coast of Africa, opposite to the Azores, 
by Lacroix, fff in South Africa (Hereroland) by Wulf #### in Eastern Africa 
* ‘Zeitsch. d. deutsch. geol. Gesellsch.,’ vol. 29 (1877), p. 274. 
t ‘ Entstehung der altkrystallinisdhen Schiefergesteine ’ (1884). 
X Tsohermar’s ‘ Min. uud Petr. Mittheil.,’ vol. 6, 1884, p. 369. 
§ ‘ Bull. Soc. Geol. du Nord,’ vol. 15, 1888, p. 69. 
|| ‘ Compt. Reud.,’ 1880, p. 1,011; and ‘ Bull. Soc. Min. Fr.,’ vol. 12, 1889, pp- 83-361. 
f Tschermak’s ‘ Min. und Petr. Mittlieil.,’ vol. 4, 1882, p. 365. 
** ‘ Zeitsch. d. deutsch. Geol. Gesellsch,’ vol. 27, IS 5, p. 676. 
ft ‘ Sverige Geol. Foren. i Stockholm Forh.,’ vol. 5, 1882, p. 10. 
++ ‘Sverige Geol. Foren. i Stockholm Fork.,’ vol. 6, 1883, p. 447. 
§§ ‘ Sverige Geol. Foren. i. Stockholm Forh.,’ vol. 7 (1884), p. 293. 
1111 ‘ Canadian Record of Science.’ 
fir ‘Bull. Soc. Min. Fr.,’ vol. 12, 1889, pp. 267-281. 
*** ‘ Ann. Rep. State Geologist for New Jersey for 1889,’ p. 30. 
ttt ‘ Geol. Beschr. d. Ostbayer. Grenzgebirge,’ vol. 2, 186S, p. 355. 
+ + J ‘Compt. Rend.,’ vol. 97, 1882, p. 1,447, and ‘Bull. Soc. Min. Fr.,’ vol. 6, 1S83, p. 3; vol. 9, 
1886, p. 46, 
§§§ ‘ Mem. de la Com. del Mapa Geol.,’ vol. 2, 1887, p. 297. 
Illlll ‘ Geol. du Sahel d’Alger. Montpellier,’ 1888, p. 149. 
fff ‘Bull. Soc. Min. Fr.,’ vol. 12, 1889, p. 171. 
* ### Tschermak’s ‘ Min. und Pet. Mittheil.,’ vol. 8, 1887, p. 193. 
