IV CONTENTS. 



Number 26. 



Page 



Art. XII. — 27-Day Auroral Period and the Moon ; by H. H. 



Clayton . . 81 



XIII. — Combination Tones of the Siren and an Organ Pipe ; 



by C. Barfs 88 



XIV. — Some Products found in the Hearth of an Old Fur- 

 nace upon the dismantling of the Trethellan Tin Works, 

 Truro, Cornwall ; by W. P. Headden 93 



XV. — Kant as a Natural Philosopher; by G. F. Becker 97 



XVI. — Islands and Coral Reefs of the Fiji Group ; by A. 



Agassiz 113 



XVII. — Simple Compensated Shunt Box ; by W. M. Stlne- 124 



XVIII. — Mineralogical Notes on Cyanite, Zircon, and Anor- 



thite from North Carolina; by J. H. Pratt 126 



XIX. — Source of the X-Rays ; by J. Trowbridge and J. E. 



Burbank _ 129 



XX. — Four New Australian Meteorites; by H. A. Ward .. 135 



XXI. — Measurement of Self-Inductance by Alternating Cur- 

 rent and Electrodynamometer ; by K. E. Guthe 141 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Influence of Proximity on Yoltaic Action, Goke : Action 

 of Light on Chlorine and Hydrogen, Gautier and Helier, 144. — Series Spectra 

 of Oxygen, Sulphur and Selenium, Bunge and Paschen, 145. — Production of 

 Electricity by Chemical Means, Andreas: Graphite, Graphitite and Graphitoid, 

 Weinschenk, 146. — Manuel d' Analyse Chimique appliquee a l'Examen des 

 Produits Tndustriels et Commerciaux, E. Fleurent: Organic Chemistry for the 

 Laboratory, W. A. No yes, 147. — Deductive Physics, F. J. Rogers: Modes of 

 Motion : or Mechanical Conceptions of Physical Phenomena, A. E. Dolbear : 

 Electrical Wind, S. Arrhenius : Heat produced by the Rontgen rays, E. Dorn. 

 148. — Effect of Cathode rays on air, P. Lenard: Electric arc between alumi- 

 num electrodes, Y. v. Lang : Stratified discharges of electricity in free air, 

 M. Toepler, 149. 



Geology and Natural History — Geology of Johnson County, Iowa, S. Calvin, 149. 

 — Iowa Geological Survey ; Annual Report, 1896, S. Calvin: La face de la 

 Terre (Das Antlitz der Erde), E. Suess: Boletin del Instituto Geologico de 

 Mexico, J. G. Aguilera, 152. — Zirkelite, M. E. Wads worth: Krystallograph- 

 ische Winkeltabellen. Y. Goldschmidt, 153. — Tabellarische Uebersicht der 

 Mmeralien nach ihrer krystallographisch-chemischen Bezichungen geordnet. 

 P. Groth, 154. — Mmeralogie de la France et de ses Colonies, A. Lacroix: 

 Description of Minerals of Commercial Yalue, D. M, Barringer: Complete 

 Catalogue of Minerals, W. M. Foote, 155. — Synoptical view of the various 

 divisions of Embryophy ta siphonogama ; A. Engler, 156. 



Miscellaneous Scientific Intelligence — Scientific Collections presented to Yale Uni- 

 versity, C. Marsh, 156. — Smithsonian Institution, 1S46-1896, 158. — Wiede- 

 mann's Annalen, Jubelband: Untersuchung fiber die Bahn des Cometen, 1822. 

 IY, A. Stichenoth: Problems of Nature, researches and discoveries of Gustav 



. Jaeger, M.D., selected from his published writings : Yerzeichness sammtlicher 

 Preparate, Drogen und Mineralien mit Erlauterungen, 1897, 160. 



Obituary — Dr. Albrecht Schraut. 



