intervening areas that the next major chapter in the history of the brain 

 in hominid evolution waits to be written. 



Meantime, this little book attempts to marshal and evaluate the crucial 

 evidence at the two ends of the chain: for accurate observation and cautious 

 interpretation of these relatively simple and modest first criteria are the 

 foundations upon which any later, profounder study must be predicated. 



Johannesburg, December 1970 P. V. Tobias 



*i*£ 



