Mails (Cape of Good Hope). Returns of the estimated number of letters carried by the mail packets of the Union Steam Ship Company between the United Kingdom and the Cape of Good Hope, from May 1868 to the end of 1872:--and, of the number of registered letters forwarded from the Cape of Good Hope to the United Kingdom by the mail packets of the Union Steam Ship Company, or by vessels belonging to other parties, during the years 1871 and 1872, distinguishing the number forwarded on each voyage [electronic resource].