Story was republished in The Vampire Archives, ed. Otto Penzler (Vintage Crime/Black Lizard, 2009), isbn: 9780307473899, without a copyright permissions acknowledgement, which would indicate the story is out of copyright and in the public domain.
Author did not renew the copyright in 1954 or 1955, nor was the copyright renewed for the issue of Weird Tales in which it appears.
The 2013 text on Wikisource is an abridged version of the text that appeared in Weird Tales, both the original in 1927 and the reprint in 1935.
The full text of "The Canal" has been placed on this page, and a separate page was made for the abridged version.