ENQUIRY INTO PLANTS, I. ii. 5-6 



most 1 plants the moisture has no special name, but 

 in some it has such a name, as has been said - : and 

 this also holds good of animals : for it is only the 

 moisture of those which have blood which has 

 received a name ; wherefore we distinguish animals 

 by the presence or absence of blood, calling some 

 •animals with blood,' others 'bloodless.' Moisture 

 then is one essential ' jiart,' and so is warmth, which 

 is closely connected with it. 



There are also other internal characters, which in 

 themselves have no special name, but, because of 

 their resemblance, have names analogous to those of 

 the parts of animals. Thus plants have what 

 corresponds to muscle ; and this quasi-muscle is 

 continuous, fissile, long : moreover no other growth 

 starts from it either branching from the side ^ or 

 in continuation of it. Again ^ plants have veins : 

 these in other respects resemble the ' muscle,' ^ but 

 they are longer and thicker, and have side-growths 

 and contain moisture. Then there are wood and 

 flesh : for some plants have flesh, some wood. Wood 

 is fissile,^ while flesh can be broken up in any 

 direction, like earth and things made of earth : it is 

 intermediate between fibre and veins, its nature being 

 clearly seen especially in the outer covering' of 

 seed-vessels. Bark and core are properly so called,^ 

 yet they too must be defined. Bark then is the 

 outside, and is separable from the substance which it 

 covers. Core is that which forms the middle of the 

 wood, being third ^ in order from the bark, and 

 •corresponding to the marrow in bones. Some call this 

 oart the ' heart,' others call it ' heart-wood ' : some 



* i.e. not by analogy with animals, like ' muscle,' ' veins,' 

 flesh.' 5 Reckoning inclusively. 



