score:11
While it doesn't mention Harris by name, The Saturday Review is certainly mentioned at least three times in Wilhelm II's Comparative history, 1878-1914* (available to read and/or download from archive.org).
In 1895:
Aug. 24. Article in the Saturday Review inciting to war against Germany
(with a footnote: "Quoted, e.g., by H. F. Helmolt, Ein Vierteljahrhundert Weltgeschichte. 1894-1919, Charlottenburg, 1919, p. 20.")
In 1896:
Feb. 1. Article in the Saturday Review:
** Germaniam esse delendam."
And in 1897:
Sept. 11. The Saturday Review again demands war against Germany.
* Also available to read &/or download in the original German as Vergleichende Geschichtstabellen von 1878 bis zum Kriegsausbruch 1914 on archive.org.