Letter, William Slater, 4 Carleton Chambers, Regent St (London) to Robert O'Brien, 10 Sep 1858, with p.s. 11 Sep, re notice in The Times with mention of drawing of Killaloe. Sheet folded, written four sides. Embossed top l. first: lyre in shield. Watermark: A Cowan & Sons. Slight tear on fold.