[GILPIN, William]. An Essay upon Prints. London: G. Scott, 1768. 8° (170 x 106mm.). (Title-page a little soiled). Contemporary sprinkled calf, spine ruled in gilt, red lettering piece, sprinkled edges. Provenance: Sir James Colquhoun of Luss (armorial bookplate). Second edition. -- LUDLOW, Edmund. Memoirs. Edinburgh: Sands, Murray and Cochran, 1751. 3 volumes. 12mo (162 x 93mm.). Contemporary sprinkled calf, spines ruled in gilt, red lettering pieces, red sprinkled edges. Provenance: Sir James Colquhoun of Luss (armorial bookplate and signature). -- DEFOE, Daniel and Samuel RICHARDSON. A Tour through the Whole Island of Great Britain. London: For J. and F. Rivington [and others], 1769. 4 volumes. 12mo (170 x 101mm.). Contemporary calf, spines ruled in gilt, red and blue lettering pieces, red sprinkled edges (upper cover of volume II a little stained). -- [GREGORY, John]. A Comparative View of the State and Faculties of Man with those of the Animal World. London: For J. Dodsley, 1766. 8° (156 x 92mm.). Half-title. Contemporary sprinkled calf, spine ruled in gilt, red lettering piece, red sprinkled edges. Provenance: Sir James Coquhoun of Luss (armorial bookplate); and 3 others (Fleming's Discourses, 1793; Blackwall's The Sacred Classics, 2 volumes, 1737). (12)