Published in The American Naturalist, in 1897, in volume 31, pages 339-343

Created: 2017-10-18, modified: 2017-10-18

Published in The American Naturalist, in 1897, in volume 31, pages 426-430

Created: 2017-10-18, modified: 2017-10-18

Published in The American Naturalist, in 1897, in volume 31, issue 363, pages 202-204

Created: 2016-11-09, modified: 2016-11-09