378 ANNUAL REPORT SMITHSONIAN INSTITUTION, 194 7 



4. Their contributions to civilization were fairly equal, allowing for 

 the distance which separated American civilizations from the rest and 

 the consequent handicaps under which they labored. 



5. The centers in both Old and New Worlds lay near the central 

 portions of the continents and close to the main mountain chains. 



6. The Old World centers (except perhaps that of China) lay near 

 the junction point of the three most important zoogeographical areas 

 north of the Arabian Sea and rather distant from Central Asia, the 

 favorite racial homeland of so many theorists. 



7. These centers of civilization apparently depended on factors other 

 than those of race. 



