ct 



X.. 



/ 



.c 



# 



ite 



i c 



, . >■ 



e fl; 



-ful 



e 



a 





3»icl dif, 



Proce. 





Perfei 



^ but th 

 ybe 



F'^babl 



e 



) 



fo buri 



ra 



•A c:,!,au(liff 



5 



«xlfls in foft 



)nce obferved 

 'f a nlne-incli 



to It ; that a 

 vail, which I 

 juft, the foft 

 unit, may in 

 the foffile al- 

 nimal and 



'o 



car 



an hepar 

 : 51 ion, might 

 brbed by the 



^^ ;th oxy-n, 



e 15 



reafon 



to 



. Its expo 



fare 



00 ^^' 



he very 

 culture; 



but p 



con' 



as 



it 



erhap^ 



J 



Sect.X. 7. 7 



MANURES 



7 



earth In the fire, Is fait of urine, comnaonly called n:iicrocormic fait, 

 which aas as a flux diffolving clay with confiderable effervefcence. 

 KIrwan's Mineralogy, Vol. I. p. 9. This microcofmic fait confifts of 

 phofphoric acid united with an ammonical, or with a calcareous bafe ; 

 and muft in the latter cafe refemble the phofphat of lime, of which 

 there are whole mountains difcovered in Spain, as mentioned In No 

 5. 5. of this Seaion ; and of which many may probably b 



difcovered 



m our own 



ntry 



Now as th 



fame 



mbinations of 



which are quickly formed by the heat of the chemift's furnaces, are 

 often performed, though more flowly, in the elaboratory of nature ; 

 it Is probable, that if this calcareous phofphorus could be procured 111 

 this country, reduced to powder, and fpread on our clay lands, that 

 it ml^ht more than any other calcareous matter render them friendly 



D 



ke the afhes of burnt bones ; which experiment 



determine 



7. As clay is lefs adapted to the growth 



f the roots of plants by 



the too great cohefion of Its particles, this may be In fome deg 



ded by frequently expofuig It 



to air imprifoned in its inter- 



ft 



by turning it over by the plough or fpade 

 thod is by planting on it fuch vegetables firfl as are k 



Another me 



bea 



well in clay, as 



clay, they not only th 



d as their roots 



fterward 



ft 



in 



th 



fo 



m 



bes 



der the mafs 



fs cohefi 



but add 



fo much carbon, and thus rather enrich 



than impoverifh 



Add to this that the lower leaves of the denfe fo 



liage of thefe vigorous vegetables are believed to give out much car 

 bonic acid by their refpiration in the fnade fimilar to the refpiratio 

 of animals J which perpetually finking down upon the furface of th 



foil is believed to fupply 



bo 



d thus alfo to rend 



more nutritive to other veo;etables, which may afterwards grow upon 



It. 



Lord Kaimes, who allows that clay, if it be moiflened after It has 

 been pulverized, becomes on drying as indurated and cohefive as 



Gg2 



before 



? 



