Pinkerton next collected and printed in 1789 certain
Vitae sanctorum scotiae, and, a little later, published his
Enquiry into the History of Scotland preceding the Reign of Malcolm III. His assertion that the
Celts were incapable of assimilating the highest forms of civilisation excited "violent disgust", but the Enquiry was twice reprinted, in 1794 and 1814, and is still of value for the documents embodied in it. Pinkerton very much wished to purge his country's history of all
Celtic elements. In this aim, through two works, the
Dissertation on the Origins and Progress of the Scythians or Goths (1787) and the
Enquiry into the History of Scotland preceding the reign of Malcolm III (1789), he developed the theory that the
Picts were in fact of the
race of ancient
Goths, that the
Scots language was a pure descendant of the Picto-Gothic language; and, moreover, that the
Gaels, or
Highlanders, were a degenerate impostor race. In an effort to advance his theories, Pinkerton turned to comparing
Celtic and Germanic
philology. He wanted to show that Scotland's Celtic
placenames were not Celtic at all—many of these attempts being discredited by modern scholars. Pinkerton thought, for instance, that
Aber (as in
Aberdeen) came from the German
über rather than from the Celtic for confluence of a river, and likewise, that the
Gaelic word
Inver (equivalent of Aber) was a borrowing from
Danish. To this end he set his energy to collecting and creating older Anglo-Scottish literature. This was all the more important as far as his agenda was concerned because of the "Celtomania" produced by the
Ossian poems of
James Macpherson. Many such works had been invented by Pinkerton. His "ancient" Anglo-Scottish tale of
Hardyknute had in fact only been composed in 1719 by
Lady Wardlaw of Pitreavie. Pinkerton subsequently invented a sequel to this epic, but after he was exposed by
Joseph Ritson, he admitted to the forgery. Pinkerton's correspondence with fellow academics is characterised by verbal abuse.
Hugh Trevor-Roper, one modern historian inclined to sympathise with at least the spirit of his views, called him "eccentric." Other historians have hinted at mild
insanity. Despite this, Pinkerton is still an important figure in the history of British
antiquarianism. ==Cartography==