REVIEW OF CHAPTERS VIII, IX, and X. 



Are canals natural or artificial ? Artificial. 



Are rivers natural or artificial? Natural. 



What are canals like? Long, wide ditches. 



What are they built for ? For the use of boats. 



What do canal -boats carry? Grain, coal, bricks, lumber, and o the f 

 articles. 



By what other means are such articles carried ? By railroads and 

 steamboats. 



What advantage have canals? Cheapness. 



What important canal crosses the State of New York ? Erie 

 Canal. 



What city at the west end of the Erie Canal ? Buffalo, on Lake 

 Erie. 



What city at the east end ? Albany, on the Hudson. 



How are canal boats raised and lowered between different ele- 

 vations ? By means of locks. 



How are some cities supplied with fresh water ? By means of 

 aqueducts. 



What are usually selected as the source ? Springs or lakes on high 

 ground. 



What natural law assists men in conducting water in aqueducts ? 

 Water always seeks a level. 



When a lake or source is not high enough, what is necessary? 

 Pumping. 



Explain if you can how Chicago is supplied with fresh water 

 from Lake Michigan. 



In constructing a suspension bridge, what parts are built first ? 

 The two high piers. 



What next? Cables are passed over the piers and fastened in the 

 ground or rock. 



What is the purpose of the cables? To hold up the fioor, which 

 is made to hang from them. 



For review lessons in geography the teacher may require the 

 pupils to give the situation of all the places which appear in the 

 text in large, black type. 



