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Excerpt from Memoirs of the Geological Survey of Great Britain: And the Museum of Practical Geology; The Geology of North Wales <p>The publication of this Memoir has been delayed considerably beyond the time when it was expected to appear, owing partly to the numerous occupations that fall to the lot of one who directs all the field work of the Survey, who edits its Geological Memoirs, and who, up to this time, has had to superintend the details of the publication of the numerous maps and sections issued. When in the middle of the composition of the work a serious illness, now removed, also for a time prevented the author carrying on any arduous literary and scientific labour. <p>The plan of the book is to give, first, a general sketch of the Geology of Wales, and then such a detailed description of Silurian rocks of North Wales, that any one may ascertain the structure of any minor area in which he may be interested. An index-map and many diagrams accompany the Memoir, but the Special knowledge sought to be communicated can only be mastered in many cases by reference to the larger maps of the Geological Survey, published in sheets, on a' scale of one inch to a mile, and to the sections, on a scale of six inches to a mile, which illustrate them. Nevertheless, for general purposes, the main geological features of North Wales may be understood by help of the index-map and diagrams that accompany this Memoir; and, indeed, by merely reading those parts that are printed in large type all the chief facts connected with the subject may be made out. It is evident that such a book would be incomplete without the Appendix on the Fossils, which has been prepared by Mr. Salter with that accurate knowledge of Silurian forms for which he is distinguished. Though such a work has nothing of a popular character in it, and makes very dry reading, yet it is likely not to be without use to those who, led by business or scientific pursuits, may feel it necessary to master the geological