Abstract
I HAVE just read Dr. J. W. Evans's letter on this subject (NATURE, January 19, p. 80). His object clearly is to arrange and name the classes according to their axes and other elements of symmetry. I have attacked the same problem from another point of view, that of arranging them so as to make clear what classes are derived from others by omission of half their repetitions. The resulting arrangement is very like that of Dr. Evans, the only really important difference being that I include the holoaxial classes with the dicyclic ones (calling them the holo classes). In the list below, the number following each name is that of the corresponding diagram in Gadolin's paper.
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POCKLINGTON, H. The Thirty-two Classes of Crystal Symmetry. Nature 113, 195 (1924). https://doi.org/10.1038/113195a0
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DOI: https://doi.org/10.1038/113195a0
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