138 Review in Botany. 



What trees are valuable for their sap ? India-rubber, sugar- 

 maple, and the pine. 



What is made from the sap of the India-rubber tree? Of the 

 sugar-maple tree? Of the pine tree? Where is India-rubber 

 largely produced ? Turpentine and tar? 



What tree is valuable for medicine obtained from its bark ? 

 Where does that tree grow ? Mention some other plants which 

 yield medicines. From what tree is bark obtained that is used 

 in tanning leather ? Hemlock. Is it a deciduous, or an evergreen 

 tree? 



What trees are very valuable for their wood used in making 

 pianos, etc. 



Where do mahogany and rosewood trees grow ? 



How are these woods used ? 



Mention some other ornamental woods. 



Mention the trees which are valuable for their fruits? Where 

 do oranges grow? Bananas? Olives? Cocoanuts ? Dates? 

 Pineapples? Lemons? Cloves and nutmegs ? What is obtained 

 from olives? 



What plant, although yielding no food, drink, clothing, medi- 

 cine, shelter, or ornament, is used very extensively in nearly every 

 country in the world ? Tobacco. Where is it extensively cul- 

 tivated ? 



Mention some poison plants. Which produces opium ? 

 Where is it mostly cultivated ? Mostly used ? 



Upon what do trees and plants live ? Mention the five parts 

 of a tree or plant. What are the duties of the roots ? Of the 

 leaves? How does the sap get from the roots to the leaves? 

 Does the sap always move in one direction ? Is it the rising or 

 the returning sap which provides the tree with nourishment and 

 causes it to grow ? In what part of an apple, a pear or a maple 

 tree is the increase made ? Between the hard wood and the bark. 

 How can you ascertain the age of such a tree ? Do all trees and 

 plants grow in this way ? Mention some which increase on the 

 outside of the hard wood ; on the inside. Which are ex'o-gens? 

 En'do-gens ? 



In what different ways are seeds distributed over the earth ? 

 In what ways other than by seeds are some trees and plants 

 increased in number? 



