That's the one I referred to earlier, Frank Miller. Died in 1944.
His contributions on ballads were to the 'Transactions of the Dumfries and Galloway Natural History and Antiquarian Society'.

Relevant articles include:
The Ballad of Kinmont Willie Series II, Vol 23, p292
The Blacklock Mss at Annan          II      24   155
Allan Cunningham's Contributions to Cromek's 'Remains of Nithsdale and Galloway Song' (That one should be fun!)
                                     III    8    40
The MacMath Song and Ballad MS       III    12    88
Old Collection of Songs and Poems    III    16    10
The Mansfield Manuscript, an old Edinburgh Collection of Songs and Ballads                               III    19    54

If anyone has access to any of these I'd be interested to know what they contain.