VI CONTENTS. 



Number 154. 



Page 

 Akt. XXXIV. — Buried Channels Beneath the Hudson and 



its Tributaries ; by J. F. Kemp . . 301 



XXXV. — Thomson's Constant, <?, Found in Terms of the 

 Decay Constant of Ions, within the Fog Chamber ; by 

 C. Barus 324 



XXXVI. — Application of the Cobalti-Nitrite Method to the 



Estimation of Potassium in Soils; by W. A. Drtjshel. 329 



XXXVII. — Iodometric Estimation of Chromic and Vanadic 



Acids in the presence of one another ; by G. Edgar 333 



XXXVIII. — Apatitic Minette from Northeastern Washing- 

 ton ; by F. L. Ransome _ _ 33V 



XXXIX. — Krohnkite, Natrochalcite (a new mineral), and 

 other Sulphates from Chile ; by C. Palache and C. H. 

 Warren 342 



XL. — Measurement of Extinction Angles in the Thin Section; 



by F. E. Wright 349 



XLI. — Bi-quartz Wedge Plate Applied to Polarimeters and 



Saccharimeters ; by F. E.Wright 391 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics— Determination of Phosphorus in Phosphor Tin, 

 Gemmel and Archbutt : Complex Calcium Salts, D'Ans, 399. — Radio- 

 activity, Marckwald : Simple Method for Determining Vapor Densities, 

 Blackman, 400. 



Geology — La Montague Pelee apres ses Eruptions, A. Lacroix, 400. — Publi- 

 cations of the United States Geological Survey : Graptolites of New York, 

 part 2, Graptolites of the Higher Beds, R. Ruedemann, 402. —Fourth 

 Report of the Director of the Science Division, etc., New York State 

 Museum : Rocks and Rock Minerals ; A Manual of the Elements of Petrol- 

 ogy without the Use of the Microscope, L. V. Pirsson, 403. 



Miscellaneous Scientific Intelligence — Shaler Memorial Expedition to Brazil 

 and Patagonia, 1908-09, J. B. Woodworth : British Association for the 

 Advancement of Science, 404. 



Obituary — M. Antoine Henhi Becquerel : M. E. E. N. Mascart : Arthur 

 Lister : Alexis Hansky : J. F. Nery Delgado, 404. 



