\ in CONTENTS. 



Number 270. 



t Page 



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



by G. o. Squibb 443 



LIII. — Nikitin on the Quaternary Deposits of Russia and 



their relations to Prehistoric Man; by A. A. Wright.. 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. 



Phixney 468 



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



of the California Cretaceous; by H. W. Fairbanks 47-3 



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 



LVTX. — 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, 52,0. — 

 Preparation of Acetylene. Maqttonne: New Alcohol of the Fatty Series, Suxd- 

 wik, 521. — Identity of Caffeine and Theine. Dcxstan 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. 

 Branly: 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 

 praktische Geologie, Krahmanx: Annals of British Geology 1891, J. F. 

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

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

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



Miscellaneous Scientific Intelligence — National Academy of Sciences : American 

 Philosophical Society, 527. — Hydrostatics and Elementary Hydrokinetics, G. 

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

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

 omy. Michte and Harlow, 528. 



