ILLUSTRATIONS OF THE 



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bodies among the mineral ftrata, fuch for. in- 



Itance as rock- fait, which are readily diffolved 



3t remains to examine by 



in water ; 



d it y 



hat caufe their 



folid 



been efFed 



ed. 



Here the theories who confider water as the 

 fole agent in the mineralization of foffils, are in- 

 deed delivered from one difficulty, but it is on- 

 ly that they may be harder preiTed on by ano- 

 ther. It cannot now be faid, that the men- 

 Uruum which they employ is incapable of dif- 

 folviniT the fubdances expofed to its adlion, as 



in the cafe of metallic or llony bodies ; but it 



well be afeed, how the water came 



may very well 

 to depoiite th 



falts which it held in foluti 



and to depofite them fo copioufly as it has done 



in many 



thout any vcllig 



f iimi 



] 



depolition in the places immediately 



guous. If they refufe to call to their affiftance 

 any other than their favourite element, they 



to anfwer this queftion, 



will not find it 



and 



ft feel the embarraffment of 



fyft 



fubjed to two diffi 



fo 



ly, but fo 



unhappily adjufted, that one of them is al- 

 ays prepared to a6t whenever the other is re- 



If, on the other hand, they will ad- 

 mieration of fubterraneous heat, it ap- 



m 



mit the 



pears polTible, that the local application of fuch 



heat 



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