. A description and history of vegetable substances, used in the arts, and in domestic economy . Provence and Liguria, are certainlyvery different from the climate of Andalusia, The 2 H 2 348 VEGETABLE SUBSTANCES. diversities of surface, and the vicinity of the sea,keep the air over the former places in continual playand motion, and prevent those intense heats whichunquestionably (though by a process which chemistryhas not yet fully investigated) render the juices ofplants acid, acrid, or saline; while, from the widerextent of Andalusia, and its comparative distancefrom the ocean, the air over
. A description and history of vegetable substances, used in the arts, and in domestic economy . Provence and Liguria, are certainlyvery different from the climate of Andalusia, The 2 H 2 348 VEGETABLE SUBSTANCES. diversities of surface, and the vicinity of the sea,keep the air over the former places in continual playand motion, and prevent those intense heats whichunquestionably (though by a process which chemistryhas not yet fully investigated) render the juices ofplants acid, acrid, or saline; while, from the widerextent of Andalusia, and its comparative distancefrom the ocean, the air over it is, in the warmermonths, much more quiescent. These considerations will, to a certain extent, ex-plain why there are so many varieties in a fruit,which, according to the authorities, appear all to havecome from the same part of the world ; and a furtherextension of these considerations would form a cri-terion of the situations in which it would, or it wouldnot, be desirable to cultivate the orange. Chapter VIII. FRUITS COMMO>f TO TEMPERATE AND TROPICAL CLI-MATES—CONTINUED. THE The Date—Phceiiix dactylifera. The date is one of those plants which, in thecountries that are congenial to their growth, formthe principal subsistence of man; and its localityis so peculiar that it cannot, strictly speaking, beclassed either with the fruits of the temperate cli-mates or with those of the tropical. It holds acertain intermediate place; and is abundantin regions where there are few other esculent vege-tables to be found. There is one district where, in consequence of theextreme aridity of the soil, and the want of mois-ture in the air, none of the Cerealia will grow; thatdistrict is the margin of the mighty desert which 2 H 3 350 VEGETABLE SUBSTANCES. extends, with but few interruptions, from the shoresof the Atlantic to the contines of Persia, an extent ofnearly four thousand miles. The shores, the banksof the rivers, and ever)- part of this region in whichthere i
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