Excerpt from Aids in Practical Geology

While the size of the book has not been increased in this edition, alterations have been made in more than one hundred places, whereby, it is hoped, the fairly wide subject-matter has been brought up to date or more adequately set before the reader. The book has always aimed at aiding those who enquire into the materials and history of the earth's crust, for purposes of research or for any special enterprise. At the same time, the student is not likely to forget that practical geology is fundamentally to be followed in the open country and the open air, and that these "Aids" are intended to help towards the determination of what has been personally gathered from the mountain-side or in the plain. For those who take pleasure in learning from the earth around them, a smaller volume has been written, "Open-Air Studios in Geology, " in which special appeal is made to the rock-masses as we meet them in the field. But all the wide developments of geology must rest on patient determinative work, and the invention of a new piece of apparatus for the laboratory, or the correct appreciation of a fossil, may open up the clue to some long-sought secret of the earth.

While certain modern restrictions in nomenclature have been introduced, which undoubtedly tend towards exactitude, the limits of the names of rocks and fossil genera have been kept as wide as possible.

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