Yet it seems this was not the only reason for Canadians’ turn to American water law. Returning to Brown v. Gugy, it is significant that the American case which Judge Aylwin preferred over the lower court’s ruling was from Louisiana, the only American state which based its legal system on (French) civil law. Moreover, Kent’s discussion of water law (like his discussions of many other subjects) was replete with references to civilian sources. In the pages quoted in Aylwin’s opinion (sections 6 and 7 of Kent’s Lecture 52), the American jurist cited a large number of American and English cases, as was appropriate for a work purporting to be a commentary on American law, but his very first citations were to civilian sources: Justinian’s Digest, Pothier’s Traité du Contrat de Société and Toullier’s Droit Civil Français. Later in the section, he cited again to Pothier, quoted with approval a maxim of Roman law and stated that the Code Napoléon established the same rule as said maxim.
Later commentators have divided as to what extent Kent’s use of civilian sources was substantial or rather mere window dressing, with Alan Watson arguing that Kent’s use of the Roman and French sources in the section cited above was riddled with errors and that it provided little support to his exposition of riparian rights. Nonetheless it seems that Judge Aylwin saw Kent as a good civilian source, prefacing his long quote from the Commentaries thus: