Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 3-4

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Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 10

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 14-32

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 33-43

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 44-53

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Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 70-76

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 182, pages 77-81

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Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 183, pages 103-109

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 183, pages 110-116

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Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 183, pages 166-178

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 183, pages 178-182

Published in Proceedings of The American Philosophical Society, in 1906, in volume 45, issue 184, pages 183-242

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