PART IV. AGRICULTURE. 217 



constant attention and occasional renewal, as straw, mats, 

 brushwood, &c. The side next the sea, of such as fig. 6*., which 

 forms an angle with the base of forty-five degrees ; and all the 

 variety of slopes or inclined planes between that, and those 

 wdiere the inclination forms an angle of thirty-five degrees, may 

 be covered with flag-stone*, jointed with cement made of clear 

 sand and powdered, unburnt limestone, puzzolana earth, or 

 Roman cement : or, if flagstone cannot be had, clay may be 

 found, and bricks of proper kinds may be made, and used in 

 the same manner as stone. 



In those planes inclined between 40 and 45 degrees, it will 

 often be more economical to cover with stones about six or 

 eight pounds weight, laid on eighteen or twenty inches deep ; 

 or with a bed of moss of three inches, or peat-moss f of six 

 inches thickness, laid on the bank, and then a covering of si- 

 milar stones of only six or eight inches thick : or these stones 

 may be causewayed, or laid in strong clay, and their surface 

 jointed or plastered over with lime, or strong cement 6f any 

 kind that will harden | quickly, and endure the action of the 

 tides and the air, which will operate upon it alternately, &c. 

 Cases may occur where it will be most economical to cover the 



* A case of this kind occurred at Tullyallan, the property of Lord Keith, 

 f That kind called the flow-moss will answer best. 

 t See p. 207. 



