An Introduction to a Biology 



of the necessity of carrying the implement about 

 with one for the whole of one's life. The energy 

 thus set free by the invention of the detachable limb 

 would be put back into capital to be devoted to 

 the further improvement of the liberating invention. 



The animal can never put down its tools. Man 

 by gradually devising the detachable tool would 

 gradually come to divide up his time, into that 

 time in which he had his tools in his hand and that 

 time in which he had laid them aside. These leisure 

 moments might be devoted to the imagining of 

 new ways in which he could use his rude flint tools, 

 and new ways in which he could make his tools 

 out of the chunk of flint ; as, for instance, the 

 utilisation for skin-scrapers or arrowheads of the 

 flakes which he struck off the core of the flint whilst 

 making his spear or mattock. But it is more prob- 

 able that such ingenuities would strike him whilst 

 he was actually absorbed in the business of manu- 

 facture, and that in his leisure moments he would 

 think to himself how pleasant and how profitable 

 was his work. He might even occasionally and 

 dimly contemplate the wonders of the universe. 



But in those hard days these reveries must have 

 been rare, and such flights as his imagination took 

 were not the voiced exaltation of the lark, but the 

 silent intent manoeuvring of the hawk. Thought, 

 at first, was all transitive, all intent on the task of 

 escaping beasts of prey and providing for oneself 

 and family. 



The existence of man in those early days must 

 have been terribly hard. The very thing which was 

 destined to make him lord of creation might very 



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