On the Relations of the Basic and Acid Rocks of the Tertiary Volcanic Series of the Inner Hebrides

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Abstract
I. Introduction Before entering upon the special subject of the present paper, I wish to be permitted to make certain personal explanations which appear to me to be necessry on this occassion. Having in my early years had the good fortune to spend much time among the Western Islands of Scotland, I was soon fascinated by the geological features of that picturesque region. Like most young geologists, I began with the fossils and collected largely from the Jurassic formations of Skye and the adjacent islands, though the interesting problems presented by the general structure of the area, and more particularly by the igneous rocks, could not wholly escape the attention of an enthusiastic beginner. The results of these youthful labours were eventually communicated to this Society in the year 1857. Having been appointed to the Geological training in methods of detailed geological mapping, and it so happened that this training lay, in large measure, among the ancient volcanic rocks so copiously developed among the Old Red Sandstone and Carboniferous formations of Central Scotland. I was thus led from the very outset to take a keen interest in volcanic geology, and the experience gained among the records of Palæozoic eruptions induced me to return to the study of the latest series of volcanic outbursts in Britain-those of the Western Isles. From time to time I communicated to the Royal Society of Edinburgh accounts of my investagations. At last, in the year 1871, I had advanced far enough to be able to

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