CONTENDS TO VOLUME XL 



Number 61. 



Page 

 Art. I. — Stereographic Projection and its Possibilities, from 

 a Graphical Standpoint; by S. L. Penfield (With 

 Plate I.) . . .. i 



II. — Mode of Occurrence of Topaz near Ouro Preto, Brazil ; 



by O. A. Derby 25 



III. — Chemical Study of the Glaucophane Schists ; by H. S. 



Washington ..____ 35 



IY. — Nature of the Metallic Veins of the Farmington 



Meteorite; by O. C. Farrington 1 _._ 60 



V. — Erigenia bulbosa Nutt ; by T. Holm 63 



VI. — New Species of Merycochoerus in Montana, Part II; 



by E. Douglass 73 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Periodic Phenomena connected with the Solution of 

 Chromium in Acids, W. Ostwald, 84. — Krypton, Ladenburg and Kruegel, 

 85. — Combustion of Gases, S. Taktar, 86.— Combustion of Acetylene in Air 

 enriched with Oxygen. G. L. Bourgerel: Inverse effect of a magnetic field 

 upon an electric charge. M. V. Cremietj: Electrical Convection, M. V. 

 Cremieu : Unipolar Induction, E. Lecher, 87. — Electron theory of metals, P. 

 Prude: Simple modification of the Wehnelt interrupter, 88. 



Geology and Mineralogy — Geological and Natural History Survey of Minnesota, 

 Vol. V, N. H. Winchell and U. S. Grant, 88. — Etude mmeraiogique et 

 petrographique des Roches gabbroi'ques de l'Etat de Minnesota, Etats Unis, et 

 plus specialment des Anorthosites, A. N. "Winchell: Roches Eruptives des 

 Environs de Menerville, AlgeYie, L. Duparc, P. Pearce and E. Ritter : Char- 

 nockite Series, a group of Archean Hypersthenic rocks in Peninsular India. T. 

 H. Holland: Geologische Skizze der Besitzung Jushno-Saoserk und des Beiges 

 Deneshkin Kamen in nordlichen Ural, P. Loewinson-Lessing, 89.— Some Prin- 

 ciples controlling Deposition of Ores, C. R. Van Hise: Physical Geography 

 ot the Texas Region, R. T. Hill, 90. — Field Operations of the Division of Soils, 

 1899, M. Whitney: Etudes sur les Mineraux de la Roumanie, P. Poni, 91. — 

 Mineralogy, F. Rutley: Corundum and the Basic Magnesian Rocks of West- 

 ern North Carolina, J. 0. Lewis, 92. 



Botany — Maladies et les Ennemis des Cafeiers, G. Delacroix, 92. — Monographie 

 und Iconographie der Oedogoniaceen, K. E. Hirn, 93. — Ueber Sclerotinia 

 cinerea and Sclerotinia fructigena, M. "Woronin : Platydorina, a new Genus of 

 the Family Volvocidae, from the Plankton of the Illinois River, G. A. Kofoid, 

 94. 



Miscellaneous Scientific Intelligence — Velocity of Seismic Waves in the Ocean, 

 C. Davison: Old Indian Village, J. A. Udden, 95. — Anleitung zur mikroskop- 

 ischen Untersuchung der vegetabilischen Nahrungs- und Genussmittel, A. F, 

 W. Schimper, dd. 



