Letter, William Slater, 4 Carlton Chambers, Regent St, SW, (London) (to Robert O'Brien), 12 July 1861, saying that the portfolio has arrived and commenting on proposed pavement in Westropp Memorial (in restoration of St Marys Cathedral). Sheet folded, written two sides. Embossed top l. A Clarke, Post Office, 132 Jermyn St. Watermark: Joynson 1861.