CONTENTS 



Page 



Original Papers 



Botany. — The American species of Maximilianea (Cochlospermum) . S. F. Blake. . 125 



Oceanography. — The problem of physical oceanography. A. L. Thuras 132 



Abstracts 



Botany 136 



Hydrology 137 



Paleontology 138 



Proceedings 



Washington Academy of Sciences .' 138 



Entomological Society 140 



Scientific Notes and News 147 



OFFICERS OF THE ACADEMY 



President: Alfred H. Brooks, Geological Survey. 

 Corresponding Secretary- Robert B. Sosman, Geophysical Laboratory. 

 Recording Secretary: William R. Maxon, National Museum. 

 Treasurer: W. L. Faris, Coast and Geodetic Survey. 



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

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

 agers, 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 Journal.) 



ASTRONOMY 



BiGELOW, Harriet W. Declinations of certain North Polar starf determined 



with the meridian circle. 61 pp $0.15 



PHYSICS AND CHEMISTRY 



Becker, George E., and Day. Arthur L. The linear force of growing crystals. 



6 pp .' * .05 



Becker, George F., and Day, Arthur L. An interesting pseudosolid. 11 pp., 



1 pi 0.10 



Bell, Alexander Graham. Aerial locomotion, with a few notes of progress in 



the construction of an aerodrome. 42 pp., 17 pi .20 



Clarke, Frank WigglEsworth. A new law in thermochemistry. 37 pp . 15 



Clarke, Frank WigglESWorth. On basic substitutions in the zeolites. 10 pp.. 0.10 



McBain, James W. The experimental data of the quantitative measurements of 



electrolytic migration. 78 pp .20 



ScHALLER, Waldemar T. Some calcite crystals with new forms. 16 pp., 8 figs ... 0.10 



Send orders with check or stamps to the Corresponding Secretary, Robert B. Sos- 

 man, Geophysical Laboratory, Washington, D. C. 



