OKOAMC BODIES IN PLANTS. 4 1 



down; in the bark they run vertically, that is, toward 

 the centre of the tree. It is supposetl that air obtains 

 access to the body of t • tubes. 



Leaves are usually i a of the 



bark. They have a net work ol veins running through 

 them in every direction, conveying fluids to all parts; 

 an<l also have on their outrt" surfaces, innumerable 

 little pores or mouths, through some of which they 

 breathe out, and through others draw in, water and 

 various gases These functions of the leaf will be 

 noticed again in a subsequent chapter. 



ei, Ti, ,v ![. THE GREAT NL....,r.u .-i.NU DIVERSITY OF OROAMC 

 BODIES IN PLANTS. 



The organic portion in these several parts of the 

 plant, consist of a great variety of substances, with 

 tlie more common of which at least, the fanner ought 

 to be acquainted. 



The oreanic bodies of plants are exceedingly 



I >t every plant has some one or more 



Thus we see indian rubber the 



i 't ouc tree, gutta percha of another, sago of 



various perfumes from one plant, and dis- 



<iors from another, as in the rose or the 



1....^ I uc of one class, the &kunk cab'""" "- the 



tomato of the other; some also have a t or 



aromatic taste, such as the sassafras anu u 



In short the variety of bodies that thus comt; 



diflferent qualities to plants, or often to ' 



parts of the same plant, are more nu 



would b< ! by one who had not at; 



what to t. ^ ' t. 



The diiierent oib and sugars, for instance, which 



exist in \'<r.t:,u].^^ may be counted lv • - I «......, 



ties ain.: :U- new kinds ar»- 



discoviTtii; s) w ith the various cxtr. I «: 



A* 



