MINERALS. 



Erosive work of rivers. 



1. Kaiii. 



(a) Supplies water to surface and underground streams. 



(b) Carries acids in solution. 



(c) Carves soft rock. 



(d) Wears harder rock. 



(e) Carries sediment to streams. 



2. Underground Streams. 



(a) Dissolve mineral matter. 



(b) Form caves in calcareous rock. 



(c) Furnish river with mineral matter in solution. 



3. Rivers. 



(a) Slowly dissolve rock in stream bed. 



(b) Wears stream bed. 



(c) Meanders and broadens its valley. 



(d) Carries and wears detritus supplied to it. 



(e) Assorts and deposits material in bed. 



(f) Forms waterfalls, gorges, canons and broad valleys. 



NOTE. It is important that the buds should open in the house, because later 

 in the spring so many things claim attention that they are apt to be neglected. It 

 is not so important that children should gain a great many facts as that they 

 should have the right attitude toward nature. It is not best for them to be 

 told a great many things; they should see a great many things for themselves. 



The life histories of insects, appearance and disappearance, is of the greatest 

 importance to persons who are to live on the farm. Their habits are exceedingly 

 interesting in themselves and a knowledge of their habits is of great value in 

 combatting them. Children should be encouraged to keep the calendar year 

 after year. They easily acquire scientific names, and it is well for them to begin 

 the work correctly, although not necessary for an appreciation of insects. 



There are very few schools that have not access to a stream. Pennsylvania 

 has such noble rivers, children should be encouraged to read the chapter in the 

 history of the State that these streams are writing. 



