Published in Proceedings of the American Philosophical Society, in 1919, in volume 58, pages 397-400

Published in Proceedings of the American Philosophical Society, in 1919, in volume 58, pages 448-456

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 1-40

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 41-54

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 55-73

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 74-88

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 89-96

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 97-132

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 133-149

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 150-160

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 161-181

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 182-222

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 223-235

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 236-240

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 241-254

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 255-258

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 259-264

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 265-268

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 269-271

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 272-281

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 282-288

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 289-316

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 317-336

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 337-345

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 346-372

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 373-381

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 382-385

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 386-396

Published in Proceedings of The American Philosophical Society, in 1919, in volume 58, issue 220, pages 401-447