An Introduction to a Biology 



seeing, if persevered with, do help each other in 

 a mutual way. Nevertheless, seeing takes the lead. 

 No amount of drawing can make a man a visionary ; 

 but no amount of dissuasion and difficulties will 

 prevent a visionary from drawing. It is therefore 

 within that we must look for the source of progress. 



It is probable that the relation between the use 

 of tools and the development of the intelligence 

 was of this mysterious kind. It was a fertile inter- 

 action, and so rapidly productive, on both sides, 

 that it may be likened to the case of snails, whose 

 mode of locomotion is so arduous, and opportunities 

 of meeting so few, that they have developed an 

 arrangement (hermaphroditism) whereby when they 

 do meet each member of the pair becomes both the 

 father and the mother of a numerous progeny. 



Increased skill in the fashioning and use of imple- 

 ments would sharpen the wits of the artificer ; and 

 this gain in intelligence would be devoted again to 

 its source, the making and use of tools. And so 

 the two, intimately associated, would advance from 

 conquest to conquest. The first rude implements 

 of flint would give man an advantage over the beasts 

 which unarmed he did not possess. He would thus 

 not only vastly increase his supply of food and of 

 raiment, but also as did, for instance, the reindeer 

 men of France discover new sources of material, 

 bone and horn, for his tools. Much later, when 

 he discovered that he could further increase his food 

 supply by sowing the seeds of the sorts that he 

 ate, he would find that the seeds would grow better 

 if he worked the soil with the tools or weapons 

 that he had. He might find that the spear-head 



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