CONTENTS. 



Pago. 



Art. LII. — Electro-Chemical Effects due to Magnetization ; 



by G. O. Squier 443 



LIII. — Nikitin on the Quaternary Deposits of Russia and 



their relations to Prehistoric Man; by A. A. Weight.. 459 

 LIV. — Rigidity not to be relied upon in estimating the 



Earth's Age ; by O. Fisher 464 



LV. — Treatment of Barium Sulphate in Analysis ; by J. I. 



Phinney 468 



LVI. — Validity of the so-called Wallala Beds as a Division 



of the California Cretaceous ; by H. W. Fairbanks 473 



LVII. — Nature of Certain Solutions and on a New Means of 



investigating them ; by M. C. Lea 478 



LV1II.— Mineralogical Notes; by A. J. Moses 488 



LVIX. — Pentlandite from Sudbury, Ontario, Canada, with 



remarks upon three supposed new species from the 



same Region ; by S. L. Penfield . 493 



LX. — Notes on the Geology of Florida : Two of the lesser 



but typical Phosphate Fields ; by L. C. Johnson". 497 



LXI. — Electrical Oscillations of Low Frequency and their 



Resonance ; by M. I. Pupin 503 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics— Loss of Energy due to Chemical Union, Gore, 520. — 

 Preparation of Acetylene, Maq t jonne: New Alcohol of the Fatty Series, Suxd- 

 wik, 521. — Identity of Caffeine and Theine, Dunstan and Shepheard: Lehr- 

 buch der allgemeinen Chemie, W. Ostwald, 522. — Simplification of Tesla's 

 Experiments: Loss of Electric Charges in diffuse light and in darkness, E. 

 Branlv: Influence of the character of metallic points on alternating discharges 

 of Electricity between them, Wurtz, 523. — Registration of Magnetic variations, 

 Eschenhagen: Discussion of the Precision of Measurements with examples 

 taken mainly from Physics and Electrical Engineering, S. W. Holman: Prac- 

 tical Physics: An Introductory Handbook for the Physical Laboratory, W. F. 

 Barrett and W. Brown, 524. 



Geology and Natural History — A new Geological Society, 524. — Zeitschrift fur 

 praktiache Geologic, Krahmann : Annals of British Geology 1891, J. F. 

 Blake: Materialien zur Mineralogie Russlands, N. von Kokscharow : Reports 

 of the Missouri Botanical Garden, 525. — H. E. Seatox. Obituary, 526. — Disco- 

 liths in clay beds, A. M. Edwards, 526. 



Miscellaneous Scientific Intelligence — National Academy of Sciences : American 

 Philosophical Society, 52*7. — Hydrostatics and Elementary Hydrokinetics, G. 

 M. Minchin: Elementary Mechanics of Solids and Fluids, A. L. Selbt: Poole 

 Brothers' Celestial Planisphere and The Celestial Handbook: Practical Astron- 

 omy, Michie and Harlow, 528. 



