[1] The preface by James Maidment to Letters from Thomas Percy, D.D., afterwards Bishop of Dromore, John Callander of Craigforth, Esq., and others, to George Paton, which appeared at Edinburgh in 1830, indicates that in his latter years Callendar was reclusive, and a religious melancholic.
[1] Callander presented five volumes of manuscripts, Spicilegia Antiquitatis Græcæ, sive ex veteribus Poetis deperdita Fragmenta, to the Society of Scottish Antiquaries in 1781, shortly after he was elected a fellow.
He also presented at the same time nine volumes of manuscript annotations on John Milton's Paradise Lost, of which he had published those on Book I. in 1750.
[1] In 1766–8 Callander brought out in three volumes Terra Australis Cognita, or Voyages to the Southern Hemisphere during the Sixteenth, Seventeenth, and Eighteenth Centuries, partly translated from Charles de Brosses.
His edition of Two ancient Scottish Poems, the Gaberlunzie Man, and Christ's Kirk on the Green, with Notes and Observations, published at Edinburgh in 1782, contained questionable etymological remarks.