IV CONTENTS 



Page 

 Some remarks on the influence of insects on human welfare, by Carl D. 



Duncan .' 339 



Mosquito control tests from the Arctic to the Tropics, by H. H. Stage 349 



The primary centers of civilization, by John R. Swanton 367 



The Ryukyu people: A cultural appraisal, by Marshall T. Newman and 



Ransom L. Eng 379 



Puzzle in Panama, by Waldo G. Bowman 407 



Comparison of propeller and reaction-propelled airplane performances, by 



Benson Hamlin and F. Spenceley 429 



LIST OF PLATES 



Secretary's report: 



Plates 1,2 46 



Plates 3, 4 92 



Large sunspots (Nicholson) : Plates 1, 2 176 



Telegraphy (HiUis): Plates 1-3 206 



Plutonium and other transuranium elements (Seaborg): Plate 1 216 



Isotopes as tracers (Aten and Heyn): Plate 1 228 



Silicones (Bass): Plates 1-3 230 



Tsunami of April 1, 1946 (Macdonald, Shepard, and Cox): Plates 1-6 280 



Biology of Bikini Atoll (Schultz): 



Plate 1 301 



Plates 2-17 310 



Senses of bats (Vesey-FitzGerald) : Plates 1-4 318 



Mollusks and medicine in World War II (Abbott): Plates 1-3 334 



Mosquito control tests (Stage): Plates 1-8 366 



The Ryukyu people (Newman and Eng.): Plates 1-5 406 



Puzzle in Panama (Bowman): Plates 1-8 414 



