ERRATA. 



The firft flieet, from p. i 16, having been rather too haflily 

 corre&ed, the following grofs errors fhould be taken no- 

 tice of. 



P. I. Vienna, Sept. 23. read Fence. 



P. 15. Cryfolite lafalt- columns read cryftallizeel. 



LET- 



