183 



the centre, with the soil that is dug out 

 in making the floating-gutter and drains, 

 and has just descent enough to throw the 

 water into the drains. 



Fig. 2, in this Plate, is meant to denote 

 a ridge, in its full and complete elevation, 

 with its sides or beds a perfect inclined 

 plane, with the desirable fall of about two 

 inches in each yard. 



aa2 plate 



