OF NORFOLK. 



23 



to fay, that it is of inetlimable value. Twelve cart 

 loads (a) to an acre of the white, or rather yellow 

 marl, will, the fecond year after it is laid on, change 

 the nature of land ; molt of the exhaulling weeds 

 which impoverifh the foil, and choak the corn in 

 its infancy, are effectually dellroyed (yj, as it has a 

 great tendency to keep land clean ; it braces the 

 pores of the earth clofer together, and increafes its 

 fertility to a furprifing degree ; its benefit, though 

 not to the effect it produces at firft, is felt for thirty 

 years, when a fecond marling, of about half the 

 original quantity, may with propriety be ufed; but 

 it has been found by experience, that it does bed 

 the fecond time compounded with muck or maiden 

 earth. I mould add, that as it is of a ponderous na- 

 ture, it fuits belt when fpread on lay land, by which 

 means it mixes fooner, and better, with the native foil. 



The other fpecies of marl is, more properly 

 fpeaking, a clay, impregnated with marly particles, 

 and though good in quality, is certainly much infe- 

 rior to the other, as it requires more than double 

 the quantity to carry the fame improvement. But 

 I am inclined to think, this lall is more durable 

 than the former, not, however, from its quality, 

 but from its mixing better with the earth, and not 

 efcaping downwards fo foon. 



There are likcwife, in fome parts of the county, 

 depolits of a brown and bluilli clay, which make 



great 



