Views of Author. 
231 
Lower Magnesian Limestone, as contended for by Percival and 
many others. 
The paucity of close observations in the field should for the 
present leave theorizing to the future. Had Percival lived a 
few years longer, this want would undoubtedly have been sup¬ 
plied. My own knowledge of the lead and zinc deposits leads 
me to believe Percival’s view is the correct one, and that the 
lead-bearing regions are extensively faulted and broken, and 
that the ore deposits have a direct and close relation to the 
faults. 
