390 PRACTICAL LESSONS IN SCIENCE. 



lusks and other forms of life well repays the time spent in making 

 the investigations. 



In connection with the topographic work make notes of geo- 

 logical features, the kinds of rock, thickness of beds, the effects 

 of weathering upon them, and their relations to each other. 

 Study water sheds and divides; you can find as typical examples 

 of each in every township as you could find in the Rocky moun- 

 tains. Study the valleys of the streams, the upper, middle and 

 lower course. Notice the work done by the streams, eroding 

 here, building up there busy everywhere. Observe in how many 

 different ways during the year material is removed from an 

 eroding bank. Where the stream is making ground note the 

 order in which different forms of vegetation occupy the new-made 

 land. The study of fish and other life of the streams is interest- 

 ing and profitable. Much of this study should be general, en- 

 gaged in by the whole school, and a little time should be set 

 apart each day for report of observations. Other work may be 

 delegated to certain pupils according to their liking or aptitude. 

 Do as much work as you can and do it as well as you can, and 

 you will be astonished at the amount accomplished during a 

 season. 



