22 MR. gage's address. 



From the above principles the following conclu- 

 sions have been drawn. 



1 . That however well prepared a soil may be, it 

 cannot nourish a long succession of crops without be- 

 coming exhausted. 



2. Each harvest impoverishes the soil to a certain 

 extent, depending upon the degree of nourishment 

 which it restores to the earth. 



3. The cultivation of spindle, or tap roots, ought 

 to succeed that of running and superficial roots. 



4. It is necessary to avoid returning too soon, to 

 the cultivation of the same, or analogous kinds of 

 vegetables, in the same soil. 



5. It is unwise to allow two kinds of plants, which 

 admit of the ready growth of weeds among them, to 

 be raised in succession. 



6. Those plants that derive their principal support 

 from the soil, should not be sown excepting when 

 the soil is sufficiently provided with manure. 



7. When the soil exhibits symptoms of exhaustion, 

 from successive harvests, the cultivation of those 

 plants which restore most to the soil, should be resort- 

 ed to. 



These principles form the basis of a system of agri- 

 culture, rich in its products, but richer in its economy. 



To procure a good supply of manures will ever be 

 an important object with the skilful farmer. And so 

 much has already been written upon this subject, so, 

 many materials, vegetable, animal and mineral, may 

 be converted to this use, that the farmer who does 

 not enrich his lands, is without excuse. In the use of 

 this fertilizing substance, its preparation, its adapta- 



