While the crystal systems have been assigned different names by various authors, there is on the whole a general agreement as to which are preferable, and uncertainty rarely arises as to what system is intended, even when the less familiar terms are employed. With the thirty-two symmetry-classes, however, it is a different story. Few of them have had less than 10 distinct designations (including names, letter-symbols, and numbers) assigned, and as noted by Spencer1 one of the hexagonal classes has received at least as many as 31. It would indeed be highly desirable if some general agreement could be reached as to the names to be used for the classes, as urged by Spencer, but those he recommends seem capable of considerable improvement. A new, relatively simple, series of names is here put forward, as possibly suitable for general adoption.

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