chap, vi.] THE KITCHEN-GARDEN. 141 
strewn over it, and raked in. In all these 
cases, the walks must be immediately well 
watered, and afterwards heavily rolled. 
Sometimes the clay is mixed with water 
before applying it to the gravel. Tolerably 
firm walks may be made of sea gravel, or 
powdered sandstone, where good gravel can¬ 
not be procured, or even of sand by this 
treatment. The clay may be burnt by 
making it into a heap, intermixed and sur¬ 
rounded with faggot wood; or, as a substitute 
for burning, it may be dried by spreading it 
on the top of the furnace or boiler employed 
to heat the hothouses. Gravel walks are 
generally slightly raised in the middle, to 
throw off the water to the sides; and they 
are very frequently supplied with gratings, to 
prevent large stones, or any kind of rubbish, 
from being washed down by the rain into the 
drains so as to choke them up. When the 
walks in a kitchen garden are formed of flag 
stones, artificial stone, or brick, the material 
used is laid on brick arches or piers; and 
when grass walks are employed, they require 
no other preparation than marking them out 
on the ground, consolidating it by pressure, 
