ITALY. L E T T E X XX. 2$,$ 



and ^afterwards fine white-grey lime-mixed ,.fand- 

 ftone, and dark- grey compact ftratified limeftone.- 

 Five miles farther, at Livergmno^ the white-grey 

 fand-ftone was covered with marl-beds and blunted 

 Draggling limefiones, of a different bignefs and 

 colour j containing a great . number of petrified 

 (hells and corals. Alternating with and above 

 them occurred beds of a coarfer limeftone, in a 

 more and more horizontal fituatipn. The lower 

 I defcended in the plain, the greater the variety 

 of the ftrata, which appeared fhorter, and to be 

 produced by leveral accidents, not to be obferved 

 in the higher and more regular hills ; which, for 

 that reafon, feem to be of greater antiquity, and 

 of a different origin. 



Five miles farther, at Pianurc{ t the former white- 

 grey fand-ftone appeared again ; lower hills jcon. 

 tinued into the plain, which begins eight miles 

 off, at the gates of Bologna, and connects .with 

 Lombardy. I faw en both fides of the road 

 Urge erected {tones of a coarfe felenitic mals, 

 which is dug at S. Rofilo, and proves that there 

 has been formerly in thefe parts many folutions 

 of calcareous ftones by vitriolic acids ; whofe con- 

 comitant heat and fermentation have probably pro- 

 duced many effects, which we cannot explain. 



I have made, at Rome, Florence, .and. Bologna, 

 a meteorological obfervation, which ieems to have 



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