IV CONTENTS 



Pace 



Some chemical studies on viruses, by Wendell M. Stanley 357 



The scent language of honey bees, by Ronald Ribbands 369 



The army ants, by T. C. Schneirla 379 



The hibernation of mammals, by L. Harrison Matthews 407 



Parasites common to animals and man, by Benjamin Schwartz 419 



Some observations on the functional organization of the human brain, by 



Wilder Penfield 433 



The place of tropical soils in feeding the world, by Robert L. Pendleton. _ 441 



Tree rings and history in the western United States, by Edmund Schulman. 459 



New light on the dodo and its illustrators, by Herbert Friedmann 475 



George Catlin, painter of Indians and the West, by John C. Ewers 483 



LIST OF PLATES 



Secretary's Report: 



Plates 1, 2_ 46 



Plates 3, 4 86 



Plates 5, 6, 7 118 



Solar activity (Spencer Jones) : Plates 1, 2 230 



Forty years of aeronautical research (Hunsaker) : Plates 1-10 262 



South African mau-apes (Dart) : 



Plates 1-4. 326 



Mechanical heart (Griff enhagen and Hughes) : Plates 1-4 342 



Viruses (Stanley): Plates 1-3 358 



Scent language of honey bees (Ribbands) : Plates, 1, 2 374 



Army ants (Schneirla): Plates 1, 2 390 



Hibernation of mammals (Matthews): Plates 1,2 414 



Parasites common to animals and man (Schwartz) : Plates 1-4 422 



Functional organization of the human brain (Penfield) : Plate 1 438 



Tree rings and history (Schulman) : Plates 1-4 470 



Dodo (Friedmann): Plates 1-5 478 



George Catlin (Ewers): Plates 1-20 528 



