CONTENTS 



ORIGINAL PAPERS Page 



Chemistry. — Note on the ice crystals which form on bare soils and on the stems of 

 plants. Victor Birckner 221 



Eioclimatics. — Intercontinental problems in bioclimatics; with special reference to 

 natural and artificial distribution of plants and animals. Andrew D. Hopkins 223 



Bioclimatics. — Bioclimatic zones of the continents; with proposed designations and 

 classification, Andrew D. Hopkins 227 



Botany. — Two new species of Bursera. Henry Pittier 229 



Zoology. — The selection of family names in zoology, W. L. McAteE 230 



Abstracts 



Geology and Hydrology 235 



Entomology 237 



Proceedings 



Philosophical Society 238 



Biological Society 241 



Botanical Society 242 



Scientific Notes and News t 244 



ADVERTISEMENT 



The Academy has on hand a miscellaneous stock of separates of papers 

 from the Proceedings (1898-1911). By authority of the Board of Managers, 

 these papers are offered for sale for a limited period at the reduced prices 

 indicated below. (Publication of these classified lists was begun on March 

 4 and will be continued in subsequent numbers of the Journai,.) 



PALEONTOLOGY 



GiDLEY, James William. Evidence bearing on tooth-cusp development. 20 pp., 



2 pi $0.15 



Girty, George H. The relations of some Carboniferous faunas. 26 pp . 10 



Hay, Oliver P. On the manner of locomotion of the dinosaurs, especially Diplo- 



docM5, with remarks on the origin of the birds. 25 pp., 1 pi 0.15 



. Knowlton, F. H. The stratigraphic relations and paleontology of the "Hell 



Creek Beds," "Ceratops Beds" and equivalents, and their reference to the Fort 



Union Formation. 60 pp 0.15 



Knowlton, F. H. Remarks on the fossil turtles accredited to the Judith River 



Formation. 15 pp 0.10 



Stearns, Robert E. C. Fossil land shells of the John Day Region with notes on 



related living species. 10 pp., 1 pi - . 10 



Walcott,. Charles D. The Cambrian fauna of India. 6 pp 0.10 



Wanner, Atreus. A new species of Olenellus from the Lower Cambrian of York 



County, Pennsylvania. 6 pp., 2 pi . 10 



Ward, Lester F. Description of a new genus and twenty new species of fossil 



cycadean trunks from the Jurassic of Wyoming. 48 pp., 8 pi . 20 



The set of 9 paleontological papers 1 . 00 



This page may be used as an order blank. Send orders with check or stamps to the 

 Corresponding Secretary, Robert B. Sosman, Geophysical Laboratory, Washington, D. C. 



