The Laws Which Regulate the Deposition of Lead Ore in Veins - Illustrated by an Examination of the Geological Structure of the Mining Districts of Alston Moor #232889

To collect, arrange, and harmonize the experience of many generations on subjects relating to the knowledge of external nature is a difficult task, but more especially when the phe nomena are removed from ordinary observation and seen only by few individuals, and at various periods of time.