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taking tliefe pitch-ftone lavas for glafs, 

 which error he detedled and proved in a 

 Memoir entitled On certain parts cf the 

 Faduan Moufita'ms ^. 



In September 1792, the Marchefe Anto- 

 nio Orologio and myfelf, having made an 

 excurfion to the Euganean mountains, to 

 vifit this celebrated naturaiift, who refided 

 at the village of Galzignano, he con- 

 duced us to Monte del MulTato, where 

 thefe fuppofed veins of glafs were to be 

 feen ; but we found that they were only 

 large mafles of pitch-fione lava, fimilar to 

 that above defcribed ; of which I was ftill 

 more convinced afterwards, as I took fome 

 fpecimens from the fpot and carried them 

 with me to Pavia. This pitch-ftone lava is 

 of tvvo kinds. The one is interrupted with 

 thin ftreaks of a white earth, which attaches 

 . to the tongue and emits an argillaceous 

 fmell, and by which the lava often appears 

 as if divided in fmall pieces ; it alfo, in 



* Sopra parecchle localita de' Monti Padovani. 



many 



