104 RECENT PUBLICATIONS 
—New York State Museum, Bulletin of. Petroleum and Natural Gas in 
New York. By Edward Orton, LL.D. University of State of New York, 
Albany, 1899. 
—QOyYEN, P, A. Kontinentalglaciation og Lokalnedisning. Alb. Cammermey- 
ers Forlag. Archiv for Mathematik og Naturvidenskab. B. XXI, Nr. 7. 
Lund, 1899. 
—RICHTER, E. Les Variations Périodiques des Glaciers. Quatriéme Rap- 
port, 1898. Extrait des Archives des Sciences Physiques et Naturelles, 
Th, WINE, wise), (Gemerres 
—RoGErRS, A. W., and E. H. L. SCHWARz. Notes on the Recent Lime- 
stones on Parts of the South and West Coasts of Cape Colony. Trans- 
actions of the South African Philosophical Society. 
—Rupzki, M. P. Ueber die Gestalt elasticher Wellen in Gesteinen. IV 
Studie aus der Theorie der Erdbeben. Extrait du Bulletin de 1 Acadé- 
mie des Sciences de Cracovie, Juillet, 1899. 
. — SALISBURY, ROLLIN D., and Wm. C. ALDEN. The Geography of Chicago 
and its Environs. Bulletin of the Geographic Society of Chicago, No. 1. 
Published by the Geographic Society of Chicago, 1899. 
—WoosTER, L. C., Ph.D. Educational Values of the Natural Sciences. 
Department of Natural Sciences, State Normal School, Emporia, Kan. 
—ZITTEL, Professor D. K. A.v. Zur Literaturgeschichte der alpinen Trias. 
Wien, December 1899. 
