Teacher's Leaflet. ^47 



(2). What is the difference in color of the water of a brook when it 

 is flooded or when it has the ordinary amount of water in it? What 

 causes this difference in color? 



(3). Make the following experiment to show what the brook is carry- 

 ing: After a storm or when the brook is flooded during the fall or 

 spring and the water is roily, dip from the swift portions of the stream 

 a glass fruit jar full of water. Place it on a window sill and do not 

 disturb until the water is clear. All of the fine mud which settles at 

 the bottom of the jar is what that quart of water was carrying down 

 stream, and if one quart of water could carry this much of soil, try to 

 make the pupil think how large a quantity of soil is being carried by the 

 whole brook. 



(4). Where did the brook get the soil to make its water roily? Study 

 its banks. Do you think the soil in the water came from the banks that 

 are covered by vegetation or where the soil is washed bare? 



(5). How did the brook dig up the soil that it carries in the flood? 



(6). Do you think one of the tools the brook digs with is the current? 

 Try and find a place where the swift current strikes the bank and see 

 if you think the latter is being worn away. 



(7). Does the swift current dig more soil where it is flowing straight 

 or where there are sharp bends? 



(8). How are the bends in a brook or creek made deeper? 



(9). Thrust your bare hand and arm down into the swift current of a 

 brook when it is very roily. Do you feel more than the water strike 

 against your arm and hand? 



(10). Does the water loaded with soil and pebbles dig more vigor- 

 ously into the banks than just the water alone could do? 



(11). If you can reach the bottom where the current is swift, note if 

 there are any pebbles striking your fingers as they are being rolled along 

 in the bed of the stream. 



(12). Which washes away more earth and carries it down stream, a 

 fast or a slow current? 



(13). Does the water of a brook flow fastest when its waters are low 

 or high? 



(14). When the brook is at highest flood, do you think it is working 

 hardest? If so, explain why? When it is working hardest and carrying 

 more soil and gravel, does it make a different sound than when flowing 

 slower when its waters are clear? 



(15). How does a brook look when it is doing the least amount of 

 work possible ? 



A Brook Puzzle for Pupils to Solve. — When we have a load to carry 



