Abstract
The structural, petrological and chemical features of aplites are discussed with special reference to the problem of their origin. Their relationships to the country-rocks are examined and the question is raised as to whether their mode of formation may be deduced from a study of the structural evidence alone. The petrological characters of several aplites are described with particular reference to the significance of such marginal phenomena as the forms of micrographic intergrowths of quartz and orthoclase. No new chemical facts are presented but the available evidence in this field is reviewed in the light of the structure and petrology of these rocks. It is concluded from the study of these features that the aplites with which the authors are acquainted result from the crystallisation of a magma fraction rather than by the replacement of country rocks in situ.
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