■V* 



0' 



584 



ADDITIONAL NOTES. 



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I 



imported into this country, and propagate their malady amongft the 



-native rats of this climate 



9. to he mjertedat the endofSeSf, X. 7. 8./. 228. 



, Having now fpoken of carbon, of lime, and of clay, which with 

 Siliceous fand conftitute the principal ingredients of fertile foils, fome 

 i-ules may be required for diftinguifliing the goodnefs of foils by the 

 purchafcr, as well as by the poffefTor. For this purpofe the chemical 



lyfis would firft prefent itfelf, as attempted by Fordy 



and lately by Giobert, Bergmen, Kirwan, and oth 



many 



years ago, 



M. Giobert found, that one pound of a fertile foil in the vicinity of 



Turin contained of carbonic matter, which would burn and flame. 



^bout twenty -five grains, of flinty fand about 4400 



of clay 



about 600 grains, of lime about 400 grains, andlaftly, of water about 

 70 grains. The fame author found that one pound of fome barren 

 foils was compofed of filiceous earth about 3000 grains, of argillace- 

 ous earth about 600 grains, and of calcareous earth about 400 

 and I fuppofe without any carbonic matter. 



to 



Mr. Kirwan ingenioufly obferves, that the quantity of moifture, 

 which fome countries are more liable to than others, (hould be nicely 

 attended to, at the fame time that you eflimate the fertility of land 

 by its analyfis, as moift climates or fituations may require more fand 



than d 



and therefor 



th 



fam 



component par 



of foil 



would not be the moft fertile, on both the weflern and eaftern coaft 



of this ifland 



the former experiences more rain than 



the fummit, decUvity, and bafe of moft mountains, which 



differ in their degree of moifture 



It appears from hence, that the chemical analyfis of foils is not yet 

 arrived at fufficient accuracy to be depended upon with certainty to 



-difcover their degrees of fertility. But as the carbonic part of foil 



p r obably 



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