VI CONTENTS. 



Number 34. 



Page 



Art. XXVII. — Compressibility of Colloids, witli Applica- 

 tions to the Jelly Theory of the Ether; by C. Barus .. 285 



XXVIII.— Eolian Origin of Loess; by C. R. Keyes 299 



XXIX. — Dikes of Felsophyre and Basalt in Paleozoic Rocks 

 in Central Appalachian Virginia ; by N. H. Darton 

 and A. Keith .305 



XXX. — Diaphorite from Montana and Mexico ; by L. J. 



Spencer _ 316 



XXXI. — Detection of Sulphides, Sulphates, Sulphites and 

 Thiosulphates in the presence of each other ; by P. E. 

 Browning and E. Howe _ _ 31V 



XXXII. — Twinned Crystals of Zircon from North Carolina; 



by W. E. Hidden and J. H. Pratt 323 



XXXIII. — Brachiopod Fauna of the Quartzitic Pebbles of . 

 the Carboniferous Conglomerates of the Narragansett 

 Basin, R. I.; by C. D. Walcott : 327 



XXXIV. — Origin and Significance of Spines; A Study in 



Evolution; by C. E. Beecher 329 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Neon and Metargon, companions of Argon in Atmos- 

 pheric Air, Ramsay and Travers, 360. — Metargon, Dewar: Density and Boil- 

 ing Point of Liquid Hydrogen, Dewar, 361. — Boiling Point of Liquid Ozone, 

 Troost, 362. 



Miscellaneous Scientific Intelligence — American Association for the Advancement 

 of Science, 363. — British Association, 372. 



