. Dung is the Common Manure in all places, and there- 
fore I (hall fay nothing of it. 
Marl is not ufed, that I have obferved, in the North, 
but about the Sea fide the great Manure is Shells: Any 
one that will look into the Map, will fee how the Bay 
of Londoft^ commonly cdXVd Loughfoyle^\\t % towards the 
Eaftern part of it there lies feveral Eminencies that hard- 
ly appear at Low Watery thefeare made of Shells of Sea- 
filh of all forts, more particularly of Perriwinkle, Cockles, 
Limpet, The Country Men come with Boats at 
Low Water, and carry Loads of thefe Snells away 5 they 
leave them in heaps on the Shear, and there let them lie 
till they drain and dry, and by that means become much 
lighter for Carriage ^ they carry them by Boats as far as 
the Rivers will allow them, and then in Sacks on Horfes 
perhaps fix or feven Miles into the Country 5 they allow 
fometimes 40, but moftly 80 Barrels to an Acre 5 they 
agree with Boggy, Heathy, Claiy, Wet, or Stiff Land, 
but not with Sandy. They feemto give the Land a fort 
of ferment, as Barra doth to Bread, opening and lofen- 
ing the Clods, and by that means making way for the 
Roots to penetrate, and the Moifture to enter into the 
Fibers of the Roots : The Manure continues fo long, that 
I could find none that could determine the time of its en- 
during. 
The Reafon of its long continuance feems to be this, 
that the Shells melt every Year a little till they be all 
fpent, which requires a confiderable time, whereas Lime, 
^c. operates all in a Manure at once 5 but it’s to be ob- 
ferved, that in fix or feven Years the Ground grows fo 
mellow, that Corn that grows on it becomes rank and 
runs out in Straw tofueh a length, that it can’t fupport 
it felf, and then the Land.miih be fuffered to lie a Year 
or two, that the ferment may be a little quieted and the 
do;] s harden, and then itr will bear as long again, and. 
