HOW TO GROW GOOD GRASSES. 91 



course more abundant than those supplied by the 

 smaller streams ; for even if we could by embanking 

 so far control the water as to get it over the field 

 when we might wish, yet alluvial flats like those of 

 much of the Thames and Severn would not readily 

 drain. 



Prom facts like these it will at once be seen that 

 there is a wide difference between irrigation and 

 flooding ; and we have hence endeavoured to separate 

 what is too often confounded. 



