Filing some transcripts recently I came across this piece by Canon John Quine:
Quine, Canon John. Handbook en Route. Isle of Man. Souvenir of Coast & Mountain Electric Railways. n.p. [but Douglas]: n. pub. [but Isle of Man Tramways and Electric Power Co. Ltd], n.d.
 “Manx life is touched still with the glamour, it has still the form, of olden times. The people are a blend of Celtic and Scandinavian. The Norse tongue has left its traces in local names; the Celtic in vernacular speech. The people in the south are more Celtic, more smooth-spoken and of average mould. In the north more Scandinavian, of finer than average figure, broad in speech, brusque in manner, with all the qualities that wear best. In the north are found most choice types of manhood and womanhood, the most distinctive physique and beauty of the Manx race.”
Whilst a familiar comment by this period, it would be interesting to gather together similar comments and trace the development of this notion.