What is inorganic matter ? 



What is organic matter ? 



Why are soils from which a thrifty forest growth has Vjeen 

 removed capable at once of producing good farm crops ? 



Have yon ever observed lichen (sometimes called "moss") 

 growing on bare rock or on a tombstone ? 



If any great amount of lichen should become mixed with the 

 disintegrated rock, would it be humus and form a weak soil that 

 might produce an order of plants a little larger and stronger 

 than lichen ? 



As the higher order of 'plants come in and die dowm and mix 

 with the soil, would the process increase the productive power of 

 the soil? 



In instances in which soil has been removed by grading, could a 

 new soil be well made by adding commercial fertilizer alone ? 

 What would you apply first to such land ? 



