On the Granitic, Granitoid, and Associated Metamorphic Rocks of the Lake-district. Parts I. & II.

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Abstract
Preface . I n the following memoir I propose to consider all the points of theoretic importance connected with the granitic and granitoid rocks of the Lake-District and their associated metamorphic rocks, details and self-evident facts being described at full in the ‘Survey Memoir.’ Part I. will treat of the probable pressures under which the granitic and granitoid rocks were consolidated, these pressures being calculated from the evidence afforded by the liquid-cavities contained in the quartz. Part II. will deal with the case of the Eskdale and Shap granites and the associated altered rocks, on lithological, microscopical, and chemical grounds, the evidence for or against these masses being derived by metamorphism from the surrounding rocks being brought forward. In Part III. the Skiddaw granite and metamorphosed Skiddaw slates will be treated in a similar manner. Part IV. will comprehend a like examination of various masses of syenitic granite, syenite, and quartz-felsite, with the rocks metamorphosed around them. Lastly, Part V. will consist of a summary of results, and a statement of the theoretic points which these support. P art I.— On the Liquid-cavities in the Quartz-bearing Rocks of the Lake-district . Introduction . No one can read Mr. Sorby's masterly and elaborate paper on the Microscopical Structure of Crystals* without being struck with the amount of patient investigation it displays and the host of interesting questions it suggests. During the last few years that if has been my privilege to work in the field among the rocks of the Lake-district it has frequently been upon my

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