SCI 



Sixth Year. 

 Vol. XII. No. 289. 



NEW YORK, August 17, ij 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance. 



Entered at New York Post-Offlce as Seoond-Olass Mull-Matter. 



73 



Editorial ...... 



The Atlantic Pilot Chart for August, and the Dispersion of the 

 Great Log Raft. 



The International Congress of Americanists 74 



The History of a Doctrine . S. P. Langley 74 



A Plea for Light-Waves . Albert A. Michelson 80 

 Book-Reviews. 



The Philosophy of Kant . . . . . 8l 



Latin Accidence and Exercises 

 Elementary School Atlas . 



Notes and News 

 Letters to the Editor. 



Re-appearance of Song-Birds 



81 

 81 



. 82 

 E. P. Powell 82 



The Physical Aspect of the Planet Mars IVm. //. Pickering 82 

 The Philippine Islands . . . J. B. Steere 84 



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