CONTENTS TO VOLUME IL 



NumlDer 7. 



Page 



Art. I. — Lecture Experiment with Liquid Carbon Dioxide ; 



by C. Barus - -- 1 



II. — Observations on Percussion Figures on Cleavage plates 



of Mica ; by T. L. Walker 5 



III. — Seven Day Weather Period ; by H. H. Clatto]s- 7 



lY. — Pearceite, a Sulpharsenite of Silver and on the Crystal- 

 lization of Polybasite; by S. L. Penfield 17 



y. — Hydrology of the Mississippi ; by J. L. Greenleaf... 29 



YI. — Preliminary Note on the Relations of Certain Body- 

 plates in the Dinichthyids; by C. R. Eastman 46 



YII. — Tertiary Floras of the Yellowstone National Park; 



by F. H. KxowLTOx 51 



YIII. — New Belodont Reptile [Stegomus) from the Con- 

 necticut River Sandstone ; by O. C. Marsh. (With 

 Plate L) 59 



IX. — Separation, and its bearing on Geology and Zoogeog- 

 raphy ; by A. E. Ortmann . _ 63 



X. — lodometric Method for the Determination of Carbon 



Dioxide; by I. K. Phelps.. _ ». 70 



XL — The Opisthoteuthidffi. A Remarkable New Family of 

 Deep Sea Cephalopoda, with remarks on some points in 

 Moiluscan Morphology ; by A. E. Yerrill 74 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Fusibility of platinum in a blast-furnace fed by carbon, 

 Y. Meyer: Condition of the water iu analciie, C. Lepierre: Quantitative sep- 

 arations by means of hydrogen peroxide, Jannasch, 81. — Use of ''heavy solu- 

 tions" in the examination of commercial fertilizers, A, P. Brtaxt: Action of 

 nitiic acid upon potassium cob tlti-cyanide Jacksox and Comet, 82. — Substitu- 

 tion of various substances in the place of the water of zeolites, G-. Friedel : 

 Elementary Treatise in Electricity and Magnetism, G. C. Foster and E. Atkix- 

 SON, 83. 



Geology and Natural History — United States Geological Survey, 84. — American 

 Paleontology Prize, 85. — Midway Stage, G. D. Harris: Student's Lyell, a 

 Manual of elementary Geology, J. W. Jitdd, 86. — Chloritoid from Michigan, W. 

 H. HoBBS, 87. — Report of the Section of Chemistry and Mineralogy, G. C. 

 Hoffmann: Les Mines d'Or du Transvaal, L. De Launat, 88 — LehrlDuch der 

 Okologischen Pflanzen-geographie, E. Warming: Seventh Annual Report of 

 Missouri Botanical Garden, 89. 



Miscellaneous Scientific Intelligence —B. eight of the luminous night-clouds, 89. 

 — Publications of the Washburn Observatory of the University of Wisconsin : 

 Mathematical papers read at the International Mathematical Congress held in 

 connection with the World's Columbian Exposition, Chicago, 1893 : American 

 Association for the Advancement of Science : British Association for the Ad- 

 vancement of Science: Journal of Physical Chemistry, 90. 



Obituary— J os^PB. Prestwich: M. Daubkee, 90. 



