CONTENTS. Vll 



Number 210. 



Page 



Art. XXXVI. — Note on Earthquake-Intensity in San Fran- 

 cisco ; by E. S. Holder . 427 



XXXVII. — Relation of the Laramie Group to earlier and 



later Formations ; by C. A. White 432 



XXXVIIL— The Gabbros and Diorites of the "Cortlandt 

 Series" on the Hudson River near Peekskill, N. Y. ; by 

 G. H. Williams 438 



XXXIX.— Three Formations of the Middle Atlantic Slope ; 



by W. J. McGee . . 448 



XL. — Comparison of the Elastic and the Electrical Theories 

 of Light with respect to the Law of Double Refraction 

 and the Dispersion of Colors ; by J. W. Gibes 4G7 



XLI. — Notes on the Surface Geology of Southern Oregon ; 



by H. J. Biddle 475 



XLII. — Some Nickel Ores from Oregon ; by F. W. Clarke, 483 



XLIII. — Note on the Secondary Enlargement of Augites in 

 a Peridotite from Little Deer Isle, Maine ; by G. P. 

 Merrill 488 



XLIV. — New Meteorite from the San Emigdio Range, San 



Bernardino County, California; by G. P. Merrill 490 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Relative Size of Molecules, 492. — Chemical Decomposi- 

 tion produced by Pressure, Spring and van't Hoff, 493. — Vapor-density of 

 Ferric Chloride, Grunewald and Victor Meter, 494. — Applicatiou of inter- 

 ference fringes to Spectrum Analysis, H. Ebert: Penetration of light beneath 

 the surface of water, F. A. Forel: Velocity of Sound, J. Violle and Th. 

 Vautier : Magnetism and diamagnetism of gases, 495. 



Geology and Mineralogy — Three Cruises of the United States Coast and Geodetic 

 Survey Steamer Blake in the Gulf of Mexico, in the Caribbean Sea, and along 

 the Atlantic Coast of the United States, A. Agassiz, 495. — Descriptions of new 

 Fossil Fishes, J. S. .Newberry, 498. — Natural History of New York, Palaeon- 

 tology, J. Hall, 499.— Geology of Minnesota, Bulletin No. 2, 1887, M. E. 

 Wadsworth: Building-Stone in the State of New York, J. C. Smock: Car- 

 boniferous Trilobites : Les Dislocations de l'ecorce terrestre : Essai de Defini- 

 tion et de Nomenclature par Emm. de Margarie et A. Heim, 500. — Index der 

 Krystallformen der Mineralien, 501. 



Botany and Zoology — Flora of the Hawaiian Islands, W. Hillebrand, 501. — 

 Recent Advances in Vegetable Histology, 503. — Forms of Animal Life, G. 

 Rollestojs, 504. — Die Japanische Seeigel von Dr. Ludwig Doderlein : Biblio- 

 theca Zoologica, 505. 



Miscellaneous Scientific Intelligence — Constant of Aberration: Discovery of Small 

 Planets: Michigan Mining School, 505. 



Obituary — Gerhard vom Ratit, 50G. 

 Index to Volume XXXV, 507. 



