ARISTOTLE 



PARTS OF ANIMALS 



BOOK I 



There are, as it seems, two ways in which a 

 person may be competent in respect of any study or 

 investigation, whether it be a noble one or a humble : 

 he may have either what can rightly be called a 

 scientific knowledge of the subject ; or he may have 

 what is roughly described as an educated person's 

 competence, and therefore be able to judge correctly 

 which parts of an exposition are satisfactory and 

 which are not. That, in fact, is the sort of person 

 we take the " man of general education " to be ; his 

 ** education " consists in the abihty to do this. In 

 this case, however, we expect to find in the one 

 individual the ability to judge of almost all subjects, 

 whereas in the other case the abihty is confined to 

 some special science ; for of course it is possible to 

 possess this abihty for a limited field only. Hence 

 it is clear that in the investigation of Nature, or 

 Natural science, as in every other, there must first 

 of all be certain defined rules by which the ac- 

 ceptability of the method of exposition may be 

 tested, apart from whether the statements made 



