Abstract
In spite of its apparent complexity, elementary crystallography is fundamentally simple, and may be successfully presented to college sophomores if taken up gradually and in a logical way. In connection with a course in elementary mineralogy given by the writer at Northwestern University from 1914 to 1917 the plan outlined in the following pages was found to be practical and satisfactory. It is published in the hope that it may be found useful to others called upon to teach the subject.
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