On the Nature and Origin of the Rauenthal Serpentine

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Abstract
Introduction. The general origin of the rock serpentine as a metamorphosed peridotite is now usually admitted since the investigations, which have hecome classic, of Profs. Tschermak, Sandberger, Bonney, and other later observers. An exception is made, however, for certain masses by some geologists. One of the most interesting of these is that described as the Rauenthal serpentine. The hypothesis which was put forward by Weigand in 1875 was that this did not originate from a peridotite, that it is indeed a metamorphosed rock, but is the result of the metamorphosis of part of a gneiss. The investigation of the genesis of this rock thus has a bearing on an important general petrological question. Exception was taken to the conclusions of Herr Weigand by Prof. Bonney from the study of microscopic slices. In consequence of this, on my return journey from Switzerland in 1895, I turned aside to visit the Rauenthal, and brought back a few specimens, with the idea that they might be useful in the further examination of the question which I hoped that Prof. Bonney intended to make. As, however, it was not possible for him to visit the locality himself for some time, he asked me to continue the investigation, which I did in the summer of 1896, spending about a fortnight in the district. From the numerous specimens then collected, many slides have been prepared, the inferences from which seem entirely to corroborate the views formed on the spot. I have been able fortunately to submit

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