CONTENTS 



Page 

 Art. XXII.— Pre-Cambrian and Carboniferous Algal Depos- 

 its ; by W. H. Twenhofel 339 



Art. XXIII. — On Ferrazite? A new associate of the Dia- 

 mond ; by T. H. Lee and Luiz Flores de Moraes . . . 353 



Art. XXIV. — The Hackberry Stage of the Upper Devonian 



of Iowa; by C. L. Fenton. 355 



Art. XXV. — Tactite, the product of Contact Metamorphism; 



by-F. L. Hess 377 



Art. XXVI. — Structural Features of the Abajo Mountains, 



Utah; by M. R. Thorpe 379 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — The Single Deflection Method of Weighing, P. H. 

 M.-P. Brinton, 390. — A Method of Growing Large Perfect Crystals from 

 Solution, R. W. Moore : Modifications of PearceV Method for Arsenic, 

 391. — New Fluorescent Screens for Radioscopic Purposes, P. Eoubertie 

 and A. Nemirovsky : Scattering of Light by Solids, R. J. Strutt, 392. — 

 Apparatus for the Direct Determination of Accelerations, B. Galitztn, 

 394. 



Geology — Shore Processes and Shoreline Development, D. W. Johnson, 395. — 

 World-Power and Evolution, E. Huntington, 396 — Brachiopoda of the 

 Australasian Antarctic Expedition, 1911-1914, J. A. Thomson, 397. — 

 Pelecypoda of the St. Maurice and Claiborne Stages, G. D. Harris, 398. — 

 Tertiary Mammalian Faunas of the Mohave Desert, J. C. Merriam, 399. 



Miscellaneous Scientific Intelligence— Thirteenth Annual Report of the Presi- 

 dent, Henry S. Pritchett, and the Treasurer, Robert A. Franks, of 

 the Carnegie Foundation for the Advancement of Teaching, 400. — Publi- 

 cations of the Carnegie Institution of WashingtoD, R, S. Woodward, 401. — 

 National Academy of Sciences : The Birds of North and Middle America, 

 R. Ridgway : Biographical notice of Joseph Barrell, Charles Schuch- 

 ert, 402. 



Obituary— F. Braun, 402. 



