Abstract
Three years ago the author commenced petrological work in the Shetland Islands, and two communications dealing with different rock-groups have been published (Phillips, 1926, 1927). The work was undertaken as a subject for a degree thesis in the University of Cambridge, and the thesis as presented deals also with other rock-groups on which no published work exists. As it seems unlikely that the author's work will be continued, it has been deemed of interest to publish the following notes, incomplete though they may be.

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