CONTENTS OF VOLUME XL. 



Number 235. 



Page 



Art. I. — Inconsistencies of Utilitarianism as the Exclusive 



Theory of Organic Evolution ; by J. T. Gulick . 1 



II. — Southern Extension of the Appomattox Formation; by 



W.J. McGee 15 



III. — Experimental proof of Ohm's Law : preceded by a 

 short account of the discovery and subsequent verifica- 

 tion of the law ; by A. M. Mayer 42 



IV. — Microscope Magnification; W.L.Stevens 50 



V. — Notes on the Minerals occurring near Port Henry, N. Y., 



by J. F. Kemp , 62 



YI. — Occurrence of Goniolina in the Comanche Series of the 



Texas Cretaceous ; by R. T. Hill 64 



VII. — Method for the Reduction of Arsenic Acid in Analysis; 



by F. A. Gooch and P. E. Browning 66 



VIII. — Development of the Shell in the genus Tomoceras 



Hyatt; by C. E. Beecher— ( With Plate I) VI 



IX. — Fayalite in the Obsidian of Lipari ; by J. P. Iddings 



and S. L. Penfield 75 



X. — Selenium and Tellurium minerals from Honduras ; by 



E. S. Dana and H. L. Wells 78 



XL — Connellite from Cornwall, England ; by S. L. Penfield 82 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Chemical character of Beryllium, Kruss and Moraht, 

 86. — Estimation of the Molecular mass of Colloids by the method of Raoult, 

 Sabaneeff: Color of Fluorine and on its Spectrum, Moissan, 87. — Preparation 

 of Hydrazine from Aldehyde-ammonia, Cubtius and Jay, 88. 



Geology and Mineralogy — Post-Tertiary Deposits of Manitoba and the adjoining 

 territories of Northwestern Canada, J. B. Tyrrell, 88. — Eighth Annual Report 

 of the Director of the U. S. Geological Survey, 1886-81, 90.— Bulletin of the 

 Geological Society of A merica, vol. 1 : Salt Range in India, W. Waagen : Col- 

 lection of Building and Ornamental Stones in the U. S. National Museum, G. P. 

 Merrill, 91. — Annotated List of the minerals occurring in Canada, G. C. Hoff- 

 mann: Hygroscopicity of certain Canadian Fossil Fuels, G. C. Hoffmann: 

 Niuth Annual Report of the State Mineralogist of California, "W. Irelan, Jr. : 

 Course in Determinative Mineralogy, J. Eyerman, 92. — Giornale di Mineralogia, 

 Cristallografia e Petrografia, F. Sansoni, 93. 



Botany and Zoology — Die natiirlichen Pflanzenfamilien, Nos. 39 and 40 : Zoe, a 

 Biological Journal, 93. — Deep-sea Mollusks and the conditions under which they 

 exist, W. H. Dall, 94. 



Miscellaneous Scientific Intelligence — Le Glacier de Aletsch et Le Lac de Marjelen, 

 P. R. Bonaparte: Stone implement at New Comerstown, Ohio, 95. — Knowl- 

 edge, an illustrated Magazine of Science: L'Exposition Universelle, H. de 

 Parville: Professor Richard Owen, 96. 



