190 



Jahrg. Bd. Seite 



Williams, George H. : Geology of the Crystalline Rocks 



— On the Possibility of Hemihedrism in the Monocline 



Crystal System, with especial Reference to the Hemi- 

 hedrism of Pyroxene. R. . . 93 I 238 



— Notes on some Eruptive Rocks f rom Alaska. R. ... 93 I 505 



— On the Hornblende of St. Lawrence County, N. Y., and 



its Güding Plaues. R. 93 H 24 



— Celestite from Mineral County. West Virginia. R. . . 93 II 33 



— Geological Map of Baltimore and Vicinity. R. ... 93 II 355 



— Anatase from the Arvon Slate Quarries, Buckingham 



Co., Va. R 94 I 18 



— The Volcanic Rocks of South Mountain in Pennsylvania 



and Maryland. R 94 I 76 



— On the Use of the Terms Poikilitic and Mikropoikilitic 



in Petrography. R. 94 II 51 



— A new Machine for Cutting and Grinding Thin Sections 



of Rocks and Minerals. R 94 II 255 



— Piedmontite and Scheelite from the Ancient Rhyolite 



of South Mountain, Pennsylvania. R. 94 II 262 



Williams, G. H. and W. B. Clark: Outline of the Geo- 

 logy and Physical Features of Maryland. R. ... 94 II 72 

 Willi am s , Henry S. : The Cuboides-Zone and its Fauna. R. 91 I 115 



— The Devonian System of North and South Devoushire. R. 92 II 97 

 Williams, W. S. : Geology as a Part of a College Curri- 



culum. R 93 II 280 



Willi amson, W. C. : On the Organisation of the fossil 



Plants of the Coal-measures. R. 1891 I 170 94 II 186 369, 372 

 Willis, Baley: Graphic Field Notes for Areal Geology. R. 93 I 99 

 Willis, B. and C.W. Hayes: Conditions of Appalachian 



Faulting. R 94 II 243 



Wil Iis ton, S. W. : Structure of the Plesiosaurian Skull. R. 92 I 415 

 Wilson, E. : Fossil Types in the Bristol Museum. R. . . 92 I 394 

 Wilson, E. and W. D. Crick: The Lias Marlstone of 



Tilton, Leicestershire. With Paleontological Notes 



by E. Wilson. R 91 II 320 



W i m a n , C. : Ueber das Silurgebiet des Bottnischen Meeres. R. 94 II 98 

 Win che 11, A.: A Last Word with the Huronian. R. . . 93 II 126 



— Some Results of Archean Studies. R 93 II 515 



W i n c h e 1 1 , N. H. : Geological Survey of the State of Minne- 

 sota. Fifteenth Annual Report for the year 1886. R. 90 I 275 



— The Geological and Natural History Survey of Minne- 



sota, R : .... 92 II 282 



— The Crystalline Rocks, some Preliminary Considerations 



as to their Structures and Origin. R 94 II 51 



— The Norian of the Northwest. R 94 II 264 



Win c hell, H. V. : Geological Age of Saganaga Syenite. R. 94 II 94 

 W i n c z a , H. : Ueber ein transitorisches Rudiment einer 



knöchernen Clavicula bei Embryonen eines Ungulaten. R. 93 I 541 

 Winklehner, Hans : Neuere Forschungen über Kohle und 



Kohlenflötze. R 90 I 255 



— Ausströmungen natürlicher Kohlensäure in Süd-Persien. R. 93 II 86 



— Salzvorkommen in Süd-Persien. R 94 I 92 



Winslow, Arthur: The Geotectonic and Physiographic 



Geology of Western Arkansas. R. ....... 92 II 285 



— An Illustration of the Flexibility of Limestone. R. . . 93 I 290 



