adaptation to agriculture. 69 
^ and in such proportions, as are in 
_ious degrees favourable to the growth of the 
'vegetable productions, which man re- 
he hT ”ii the domestic animals 
tie has collected around him. 
roclct^ Pt’oeess is obvious whereby even solid 
the main- 
atoZ! '''S'*®'*™’ V simple exposure to 
diir ? J^*^**^ ®seiicy ; the disintegration pro- 
duced by the vicissitudes of heat and cold 
uo.sture and dryness, reduces the surface of 
almost al strata to a comminuted state of soil' 
or mould, the fertility „f which is ttsuali; i 
proportton to the compound nature of its iugre- 
the^etu'!r„?fl"T‘?' “'•e 
takpn ■ ’ ®tich of these, 
parativeiy*Cmr"’th "T 
proportion of I ' * edimxture of a small 
J^nd, and L T ‘'“''“y 
earth rtv i addition ot calcareous 
culturL^ ^^tghly valuable to the agri- 
wot adiust natural proportions are 
facilities aff 9^ r! T heneficial manner, the 
of lime or m ^ frequent juxta-position 
iinnm ’ SyP®nm, for the artificial 
.inp ovement of those soils which are defective 
earth’^^^ ingredients, add materially to the 
tant nffi ^^P^f*ihty of adaptation -to the impor- 
«ftce of producing food. Hence it happens 
