C O N T ENTS. 



Page 



George Jarvis Brush. With a Portrait ._ . 389 



Art. XXXIV.— Life of the Connecticut Trias; by R. S. 

 ^ Lull 397 



XXXV. — Oxalate-Permanganate Process for the Determina- 

 tion of Copper Associated with Cadmium, Arsenic, Iron, 

 or Lead ; by H. L. Ward 423 



XXX VL — Solid Solution in Minerals. II. — The Chemical 

 Composition of Analcite ; by H. W. Foote and W. M. 

 Bradley _. 433 



XXX VI I. — Chemical Composition of Neph elite ; by H. W. 



Foote and W. M. Bradley ;._.__ 439 



XXXVIII. — Description of a new Genus and Species of 



Palseechinoidea ; by Axel Olssox.__. __. 442 



XXIV. — Relations of the Degree of Metamorphism to Geo- 

 logical Structure and to Acid Igneous Intrusion in the Nar- 

 ragansett Basin, Rhode Island ; by F. H. Lahee. Pt. Ill 447 



XXXIX. — One Phase of Microseismic Motion ; bj- J. E. 



Burba^k _. . 4*70 



XL. — Microseisms Caused by Frost Action ; by J. E. Bur- 

 bank 474 



XLI. — Dahllite (Podolite) from Tonopah, Nevada ; Vcele- 

 kerite, a New Basic Calcium Phosphate ; Remarks on 

 the Chemical Composition of Apatite and Phosphate 

 Rock ; by A. F. Rogers ; with Analyses by G. E. 

 Postma *. : 475 



XLII. — Distribution of the Active Deposit of Radium in an 



Electric Field ; by E. M. Wellisch and H. L. Bronson 483 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Melting-point of Spodumene, Endell and Eieke : 

 Detection of Nitric Acid in the Presence of Nitrous Acid, Sen and Det, 

 499. — Chemical Constitution of Ilmenite, W. Manchot : Determination of 

 Alkalies in Silicates, E. Makinen : Dictionary of Applied Chemistry, 500. 

 — Properties of the Rays Producing Aurora Borealis, L. Vegard : Pressure 

 of a Blow, B. Hopkinson, 501. — Photographic Study of Vortex Rings in 

 Liquids, E. F. Northrup, 504. — Note on Nevil Maskelyne's Article, '* On 

 the Trisection of an Angle," H. S. Uhler, 506. 



Geology — Publications of the United States Geological Survey, 507. — Cambro- 

 Ordovician Boundary in British Columbia with description of fossils, 

 C. D. Walcott, 508. — Sardinian Cambrian Genus Olenopsis in America, 

 C. D. Walcott : Middle Cambrian Branchiopoda, Malacostraca, Trilobita, 

 and Merostomata, C. D. Walcott, 509. — Strophomena and other fossils 

 from Cincinnatian and Mohawkian horizons. A. F. Foerste : Arnheim 

 formation within the areas traversed by the Cincinnati geanticline, A. F. 

 Foerste : Paleontologia Universalis : Petrographic Methods, 511. —Methods 

 of Petrographic -Microscopic Research, F. E. Wright : The Soil Solution ; 

 the nutrient medium for plant growth, F. K. Cameron, 512. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 513.— 

 Sixth Annual Report Carnegie Foundation for the Advancement of Teach- 

 ing : Report of Superintendent of the Coast and Geodetic Survey, O. H. 

 Tittma.nn. 514. — Bulletin of the Bureau of Standards, 515. 



Obituary— R. S. Tarr, 515: A. L. Rotch : 0. Reynolds, 516. 



