FERTILIZERS. 99 



waste from manure heaps piled upon cultivated land ? Can there 

 be any loss to manure while it is frozen ? What two general points 

 should be observed in the use of manure? Why should it be ap- 

 plied to the land as soon as possible? What are the advantages of 

 rendering it fine ? 

 In what does the chief value of swamp muck consist? Why is it of 

 little value when first obtained ? In what three ways may the neces- 

 sary changes in its nature be brought about ? AVhy are alkaline 

 substances needed ? Why is the practice of mixing it with stable 

 manure especially profitable? Why is it a good absoi'bent? Give 

 some idea of the value of muck. 



