Sub-series consists of letters received at the Toronto office of the Central Superintendency, 1845-1877. Volume 1161 contains two dockets, dated 1877 dealing with timber rights and treaty registration. Volume 761 is a record of registered letters received at the Toronto Office, 1868-1871. Volume 1043 is a register of letters received, 1876-1877; unfortunately, this latter register is only partially accurate. The main set of correspondence is found in Volumes 405-435. This correspondence has been arranged alphabetically by name of letter author (although not all letters by the same author are filed contiguously) within year ranges. As such, the arrangement disregards the letter numbering system originally devised by the records creators and records keepers to manage and retrieve the correspondence. Volumes 740-744 and 746, collectively, are an Abstract of letters received, which forms an index to this set of correspondence. Volume 745 has, in previous National Archives inventories and finding aids, been linked to this sub-series and identified as being one of the Abstracts. However, examination of the record suggests otherwise. It appears more likely that this volume is an Abstract related to the correspondence of the Office of the Deputy Superintendent General of Indian Affairs found elsewhere in this sous-fonds. As a general caution about use of the Abstracts, users should note that items recorded in an Abstract index as having been received do not necessarily survive among the correspondence. As regards the correspondence itself (volumes 405-435), users are cautioned that the arrangement imposed at the National Archives upon these records is, frankly, confusing and seems to have overlooked the fact that there were, at least for the period up to 1 July 1858, two distinct sets of correspondence, identified with the prefix "I. L" (Indian Lands?) and "I. D." (Indian Department?), each with its own Abstract indexes. Beginning in July 1858, the original records keepers seem to have ended the distinction between "I. D." and "I. L." correspondence. The original creators and records keepers appear also to have changed the record keeping system again in June 1864.