CONTENTS OF VOLUME XXX. 



NUMBER CLXXV. 



Page 



Art. I. — Contributions to Meteorology ; by Elias Loomis. 



Twenty-first paper. With plate I, 1 



II. — Note on some Paleozoic Pteropods; by C. D. Walcott, 17 



III. — Determination of the B. A. Unit in Terms of the 



Mechanical Equivalent of Heat; by L. B. Fletcher,-- 22 



IV. — Cause of Irregularities in the Action of Galvanic Bat- 

 teries ; by H. V. Hates and J. Trowbridge, 34 



V. — Sensitiveness of the Eye to Colors of a Low Degree of 



Saturation ; by Edw. L. Nichols, - 37 



VI. — Study of Thermometers intended to measure Tempera- 

 tures from 100°-300° C. ; by O. T. Sherman, 42 



VII. — Notice of a new Limuloid Crustacean from the Devo- 

 nian ; by H. S. Williams, 45 



VIII.- — Gerhardtite and Artificial Basic Cupric Nitrates; by 



H. L. Wells and S. L. Pexfield, 50 



IX. — Occurrence of Fayalite in the lithophyses of obsidian 



and rhyolite ; by J. P. Iddings, 58 



X. — Genealogy and Age of the Species in the Southern Old- 

 tertiary ; by Otto Meyer, . 60 



XL — Probable occurrence of the Great Welsh Paradoxides, 



P. DavicUs, in America; by Geo. F. Matthew, 72 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Simplified Method of Liquefying Oxygen, Cailletet, 73. 

 - — Preparation of Cyanogen in the Wet way, Jacquemin, 74. — Two new Alikali- 

 metric Indicators, Ville and Engel : Separation of Nickel and Cobalt, Ilinski 

 and v. Knorre, 75. — Ready Method of Preparing Tartronic Acid, Pinner, 76. 

 — Pocket Book of Mechanics and Engineering, J. W. Ntstrom, 77. 



Geology and Mineralogy.- — Coals and Lignites of the Northwest Territory, G. C. 

 Hoffmann, 77. — Why there are no Fossils in the Strata preceding the Cam- 

 brian : Bone-in-Gone Structure, J. Young : Aerial Formations : Irish and Ca- 

 nadian Rocks compared, G. H. Kinahan, 78. — Cambrian or Primordial Rocks 

 of Br. Columbia, H. H. Winwood : The Folds in the Alps, M. Heim : Disintegra- 

 tion in the Alps, M. A. Brun: The Amblypoda, E. D. Cope: TheLenape Stone, 

 or the Indian and the Mammoth, H. C. Mercer : United States Geological Survey, 

 79. — Physikalische Krystallographie und Einleitung in die krystallographische 

 Kenntniss der wichrigeren Substanzen, P. Groth : Occurrence of Native Silver 

 in New Jersey, 80. — Vanadates and lodyrite from Lake Valley, Sierra County, 

 New Mexico, F. A Genth and tom Rath : Hardness of the Diamond, G. F. 

 Ktjnz, 81. — Microlite, W. E. Hidden: Emeralds from North Carolina, J. A. D. 

 Stephenson: Uranium minerals, L. W. Stillwell, 82. 



