VI CONTENTS 



Page 



A living fossil, by J. L. B. Smith 321 



Insects and the spread of plant diseases, by Walter Carter 329 



The Mexican bean beetle, by W. H. White 343 



Plant-tissue cultures, by Robert L. Weintraub 357 



The botany and history of Zizania aquatica L. ("wild rice"), by Charles 



E. Chambliss 369 



Prehistoric culture waves from Asia to America, by Diamond Jenness 383 



Masked medicine societies of the Iroquois, by WiUiam N. Fenton. 397 



The beginnings of civilization in eastern Asia, by Carl Whiting Bishop 431 



Stonehenge: Today and yesterday, by Frank Stevens, O. B. E., F. S. A-_ 447 

 Sulfanilamide and related chemicals in the treatment of infectious diseases, 



by Wesley W. Spink, M. D 479 



The future of flying, by H. E. Wimperis, C. B., C. B. E., Hon. D. Eng. 



(Melb.), Past President Royal Aeronautical Society 489 



