CONTENTS. 



Page 



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



Twenty -first paper. With plate I, . . 1 



II. — Note on some Paleozoic Pteropods; by CD. "Walcott, 17 



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

 chanical 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 Emv. 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. Penfield, 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. Davidis, in America; by Geo. F. Matthew, 72 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Simplified Method of Liquefying Oxygen, Cailletet, 13. 

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

 metric Indicators, Yille 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 : Cone-in-Cone 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 : The Lenape Stone, 

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

 79. — Physikalische Krystallographie und Einleitung in die krystallographische 

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

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

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

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

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



Botany and Zoology. — The Woods of the United States, C. S. Sargent, 82. — Euca- 

 lyptographia, von Mueller : Les Organismes Problematiques des Anciennes 

 Mers, Saporta: The Lythraceas of the United States, E. Koehne, 83. — 

 Monographie der Gattung Clematis, 0. Knutze : Recherches Anatomiques sur 

 les Organes Yegetatifs de l'Urtica dioica, A. Gravis, 84. — List of the Plants of 

 New Brunswick. J. Fowler: North American Gamopetalse, H. N. Patterson: 

 North American Mosses and Hepaticae, C. E. Cummings : Phsenogamous Plants 

 of North America, J. H. Oyster : Eggs of Echidna hystrix, Haacke, 85. 



Miscellaneous Scientific Intelligence. — American Philosophical Society of Philadel- 

 phia, 86. — American Association : Meteorological Circular Letter, 87. — Diges- 

 tion Experiments, H. P. Armsby : Chemical Periodicals, H. C. Bolton : When 

 did Life Begin, G. H. Scriener : Paradise Found, W. F. Warern, 88. 





