VI CONTENTS 



Page 

 The emergence of modern medicine from ancient folkways, by Walter C. 



Alvarez 409 



National and international standards for medicines, bj' E. Fullerton Cook. 431 

 The healing properties of allantoin and urea discovered through the use of 



maggots in human wounds, by William Robinson 451 



The aims of the Public Health Service, by Thomas Parran 463 



Excavations at Chanhu-daro by the American School of Indie and Iranian 



Studies and the Museum of Fine Arts, Boston: Season 1935-36, by 



Ernest Mackay 469 



Ras Shamra: Canaanite civilization and language, by Zellig S. Harris 479 



Blood-groups and race, by J. Millot 503 



Early Chinese cultures and their development: A new working-hypothesis, 



by Wolfram Eberhard _._ 513 



Origin and early diflfusion of the traction plow, by Carl Whiting Bishop. . 531 



Historical notes on the cotton gin, by F. L. Lewton 549 



The world's longest bridge span, by Clifford E. Paine 565 



