X 



ft 



192 



ILLUSTRATIONS OF THE 



ted limeftone. th 



th 



It 



pletely changed into fp 



marine objects are tiiol^ 



ould b 



ex- 



i exceedingly interefling to 

 amine, whether any of the phofphoric acid n 

 mains united to Ihells of either of thefe kind 



We might mod readily exped 



deg 



d 



it to be united, 

 to the fhells that are leafl 



Th 



P 



th 



periment would enable us alfo to ap 



fo 



of Mr Kirwan 



againft th 



fi 



■gument 



ng fhell 



perira 



e 



r marbles, fuch as the Carrara 

 ; *. This argument proceeds or 

 mentioned in the Turin Memoir 



for 1789, from which 



d is found in 



appears, that no phof- 



Its 



bfe 



P 



imeftone 



and 



Mr Kirwan fays, cannot be attribu- 

 ted to fufion, as phofphoric acid is indellrudible 

 by heat. 



He calls this a dem.onflration ; but, in order 



will be neceflary, 



to entitle it to that name, it will 

 firft, to prove, that phofphoric ^ 

 thofe limeftones which evidently coniift of Ih 



d 



fls in 



alized ft 



If thefe are found with 



out phofphoric acid, it is evident that the pre- 

 ceding argument fails entirely. If they are found 

 to contain that acid, it will then no doubt afford 

 a probability, though not a demonftration, that 



Carrara 



* Geol, Eflays, p. 458, 



