204 AGRICULTURE. BOOK fi 



1. Of the general causes of the failure of embankments 

 already made. 



2. Of the forms of the most secure natural shores and banks 

 of rivers, with the causes of their security. 



3. Of the modes of imitating these forms by art, or of im- 

 proving upon them. 



4. Of the preservation of embankments, or banks of rivers, 

 by erecting piers or projections to ward off the current. 



5. Of the materials with which embankments are con- 

 structed. 



6. Of the expence of making embankments. 



7. Of the management of land gained from the sea. 



8. Of the quantity of land which might be gained by embank- 

 ing, and preserved by constructing piers. 



