go The St. Louis Bridge. 



10. A most remarkable bridge (not suspen- 

 sion) is that which crosses the Mississippi 

 River at the great city of St. Louis. This 

 bridge is chiefly of steel, its three immense 

 arches resting on four stone piers. Each span 

 is over 500 feet in extent. There are two road- 

 ways, one above the other. 



One span of the St. Iiouis Bridg-e. Add the two other arches or 

 spans, each ten inches on the blackboard and similar to this. 



In what direction does the Mississippi River flow ? 

 South. In what State does it rise or begin ? Minnesota. 

 In what State does it end ? Louisiana. What large 

 rivers flow into it ? Missouri, Arkansas, Red, and Ohio. 



ii. When you look at the foundations of 

 bridges, lighthouses, and stone piers which are 

 under water, you doubtless wonder how the 

 masons built them. I shall now tell you. One 

 way is to sink or drive down heavy timbers or 

 piles around the place selected for the founda- 

 tion, fill all around and between these with 

 stone, clay, and cement, and pump out the wa- 

 ter from the enclosure ; the workmen then de- 

 scend and build the foundation. 



