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confiderable depth, the lower part will retain moi- 
fture; thus eringo and famphire often grow in fuch 
ftrata, and heath in inland fituations.. For cultiva- 
tion, perhaps, a liberal fupply of a vifcid loam, ap- 
proaching to the nature of clay, might be advantage- 
ous; a bafis thus formed would fupport the growth 
of fome kinds of vegetables, and their decay would 
increafe and improve the foil. 
14. At what time does the earth feem to be in the 
beft tate for receiving the feed of plants? Is it not par- 
ticularly when the foil feems to fmoke? What is that 
fmoke owing to—to the fermentation of the foil, the heat 
of the fun, or to what other circum/tance? 
I have never noticed this afcent of vapour, but 
when the earth is moift, and expofed to a warni fun. 
It is defirable to fow when the earth is tolerably dry, 
and then to have fome warm gentle fhowers. 
15. If earth be buried for fome time after it has been 
exhaufted, will it recover, in four or Sy a its. 
former fertility? 
16. May that not be owing to. the richnefs of the 
manure in the furface being wafbed down to it? 
17. What is the effect of expofing fuch exhaufted 
earth to the fun, or fhading it merely from its rays 2 
Perhaps the \refult of chemical analyfis, in the 
different ftates, would fupply the beft anfwer. 
18. Have you found it of fervice to change the feeds 
” of plants, from one fae or climate to another; andwhy?* _ 
— ee 
= ——— Se ee 
* An Flanders, they are faid to prefer flax-feed from Sweden or 
Roufha; and {n Sweden and Ruffia, flax-feed from Flanders. 
. 
