11] 



VOLUMES XLI-L. 



489 



Cycads, Amer. Fossil, Wieland, 43, 

 333; 46, 645; 47, 391- 



— Living, Chamberlain, 47, 449. 

 Cylinders of scoriaceous diabase, 



Emerson, 41, 321. 

 Cyperaceae, studies, No. XXVII, 

 Holm, 48, 17; no. XXVIII, 49, 

 195; no. XXIX, 49, 429; no. 

 XXX, 50, 159. 



— see BOTANY. 

 Cytology, Agar, 50, 77. 



Dakota flora, age, Berry, 50, 387. 



Dale, T. N., Algonkian Cambrian 

 boundary in Vermont. 42, 120; 

 unconformity of Berkshire schist 

 and Stockbridge limestone, 49, 

 369. 



Dall, W. H., Bivalve Mollusks of 

 the west coast of America, 42, 

 439- 



Daly, R. A., problems of the Pacific 

 Islands, 41, 153; geology of 

 Pigeon Point, Minnesota, 43, 

 423; coral-reef zone and glacial 

 period, 48, 136. 



Dana, E. S., American Journal of 

 Science, 1818-1918, 46, 1. 



Darton, N. H., geology of Luna 

 County, New Mexico, 42, 82; 

 Grand Canyon, 44, 158. 



Daugherty, L. S. and M. C, Eco- 

 nomic Zoology, 45, 335. 



Davies, A. M., Paleontology, 50, 

 467. 



Davis, M. M., Jr., Dispensaries, 46, 

 77i. 



Davis, W. A., Allen's Commercial 

 Organic Analysis, 44, 400. 



Davis, W. M., Great Barrier Reef 

 of Australia, 44, 339; Geological 

 Handbook of Northern France, 

 45, 479; Cedar Mt. trap ridge 

 near Hartford, 46, 476; notice of, 

 G. K. Gilbert, 46, 669; frame- 

 work of the earth, 48, 225. 



Davison, A., Mammalian Anatomy, 

 45, 151. 



Day, A. L., obituary notice of G. F. 

 Becker, 48, 242. 



Dayton, Ohio, geology, Foerste, 41, 

 302. 



Dean, R. S., formation of Missouri 

 cherts, 45, 411; electron theory 

 of passivity, 47, 123; Physical 

 Chemistry of Metals, 49, 147. 



Delacre, M., Histoire de la Chemie, 



49, 443- 



De Moraes, L. F., ferrazite, 48, 353. 



Density of solids, Le Chatelier and 

 Bogitch, 43, 79; balance for 

 solids, Gasnault, 47, 72. 



Densmore, H. D., Botany, 50, 78. 



Devonian of Central Missouri, 

 Greger, 50, 20. 



Diamond, dispersion, Silberstein, 

 47, 44i. 



Diamonds, in 1919, 50, 472. 



Diastrophism in the Atlantic-Arctic 

 region, Holtedahl, 49, 1; in 

 Northeastern America, Schu- 

 chert, 50, 399; in Oceanica, 

 Schuchert, 42, 91. 



Diatoms, fossil, from Pribilof Is- 

 lands, Hanna, 48, 216. 



Diffusion and rhythmic precipita- 

 tion, Stansfield, 43, 1. 



Dighton conglomerate, Perkins, 

 49, 61. 



Diller, J. S., notice of Arnold 

 Hague, 44, 73. 



Dinosaurs, functions of the "sacral" 

 brain in, Lull, 44, 471. 



— See GEOLOGY. 



Dinwiddie, J. G., hydrofluoric and 

 fluosilicic acids, 42, 421; fluorine 

 in soluble fluorides, 42, 464. 



Dispensaries, Davis and Warner, 

 46, 77I-. 



Dissociation pressures, determina- 

 tion, Allen and Lombard, 43, 175. 



Dolomite formation and the coral 

 reef problem, Skeats, 45, 81, 185; 

 origin, VanTuyl, 42, 249. 



Dolt, M. L., Chemical French, 45, 

 417; 50, 463- 



Downing, E. R., Biological Nature 

 Study, 48, 162. 



Drops and vortices, forms assumed 

 by, Hatschek, 47, 383. 



Drushel, W. A., sulphide sulphur, 

 42, 155; dialkylphosphoric acids, 

 etc., 43, 57; esters from substi- 

 tuted aliphatic alcohols, 44, 371. 



Dryer, C. R., Economic Geography, 



45, 484. 



Duckworth, W. L. H., Morphology 

 and Anthropology, 41, 564. 



Duclaux, E., Pasteur, 50, 80. 



Duff, A. W., Physics, 42, 437. 



Dunbar, "C. O., Rensselserina, 43, 

 467; Devonian of West Tennes- 

 see, 46, 732. 



Duparc, L., Russian studies, 49, 451. 



Dustfall of March 9, 1918, Winchell 

 and Miller, 46, 599; 47, 133. 



