CONTENTS. 



Page 



Art. LXI. — Inversion of Temperatures in the 26*28 day 



Solar Magnetic Period ; by F. H. Bigelow 435 



LXII. — Remarks on Colloidal Silver ; by C. Barus 451 



LXIII. — Duration of Niagara Falls; by J. W. Spencer 455 



LXIV. — Resonance Analysis of Alternating Currents ; by 



M. I. Putin. Part II 473 



LXV. — Distribution and Probable Age of the Fossil Shells 

 in the Drumlins of the Boston Basin ; by W. O. Crosbt 

 and H. O. Ballard 486 



LXVI. — Improved Form of Interrupter for large Induction 



Coils; by F. L. O. Wadsworth _.. , 496 



LXVIL— Post-Glacial Faults at St. John, N. B.; by G. F. 



Matthew. (With Plate XI) ... . 501 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — New Iodine Bases, V. Meyer and Hartmanx, 503. — 

 Anomaly in the Density of Nitrogen, Rayleigh, 504. — Carbon Boride, Moissax, 

 505. — Carbides of Calcium, Barium and Strontium, Moissan : Size of the mole- 

 cule of Mercurous chloride, V. Meter and Harris, 506. — Text-book of Inor- 

 ganic Chemistry, G. S. Newth: Elementary Chemistry. G. R. White: The 

 mean density of the Earth, Poynting. 507. — Mean density of the Earth, 

 E. D. 1'restox: Source of friction electricity, C. Christiansen, 508. — Electrical 

 conductivity of absolutely pure water. Kchlrausch and Heydeweiler: Self 

 induction and capacity of coils, C. Fromme: Spirals with compensated self 

 induction, Tesla. 509. 



Geology and Mineralogy — Pre-Olenellus fauna, Dr. F. Noetlixg, 509. — Mineral 

 Industry, its Statistics. Technology and Trade for 1893, 510. — Catalogue of 

 Minerals, G. L. English, 511. 



Botany — Vegetable Resources of India, 511. — Grafting, M. L. Daniel, 512. — 

 Inflorescence in Descriptive Botany, M. F. Hy : Researches on the Structure 

 and affinities of Terebinthaceae, M. Jadix, 513. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 513. 

 Obituary-- William Topley, 514. 



