This early work on mineralogy and petrography is both expensive and hard to find in its first edition. It contains details on polarizing microscopes, mineral determination, igneous rock types, geological mapping and much more. This is a fascinating work and is thoroughly recommended for anyone interested in geology. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.