Robert S. Rait, An Outline of the Relations between England and Scotland…
“ The Scottish nobility began to find its true place at the English Court; the Scottish adventurer was irresistibly drawn to London; the Scottish Presbyterian found the English Puritan his brother in the Lord; and the Scottish Episcopalian joined forces with the English Cavalier. The history of the seventeenth century prepared the way for the acceptance of the Celtic theory in the beginning of the eighteenth, and when philologists asserted that the Scottish Highlanders were a different race from the Scottish Lowlanders, the suggestion was eagerly adopted. ”
