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 ? Why are alkaline 

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

 manure especially profitable? Why is it a good absorbent? Give 

 some idea of the value of muck. 



