The letters appear to be to John Murray III. They are arranged chronologically. Those letters that have a supplied year and no other date are placed at the end of the relevant year.

1840: folios 1-8;

1841: folios 9-11;

1842: folios 12-13;

1843: folios 14-18;

1844: folios 19-20;

1845: folios 21-36;

1846: folios 37-42;

1847: folios 43-54;

1848: folios 55-56;

1849: folios 57-67;

1850: folios 68-79;

1851: folios 80-88;

1853: folios 89-102;

1854: folios 103-104;

1855: folios 105-106;

1856: folios 107-108;

1857: folio 109;

1858: folios 110-113;

1859: folios 114-115.