This lists all identified correspondents. Their letters can only be accessed through the Letters page.
Macmillan, Alexander, 1818-1896 publisher
Macmillan, Sir Frederick Orridge, 1851-1936 publisher
McPherson
MacQuoid, Thomas Robert, 1820-1912 illustrator, painter
Macready, Jonathan Forster Christian, 1850- son of W.C. Macready, surgeon
Macready, William Charles, 1793-1873 actor (Letter not to Irving)
MacVeigh, Isaac Wayne, 1833-1917 lawyer, US attorney general & ambassador
MacWhirter, John, 1839-1911 landscape painter
McWilliam, G.A.? old acquaintance, writer?
Madge, Sir William Thomas, 1st Bart, 1845-1927 newspaper proprietor
Madison Square Theatre Company, New York
Maeterlinck, Maurice Polydore Marie Bernard, 1862-1949 Belgian playwright & poet
Maggee, Miss 1890 (Magee?)
Magnard, Francis, 1897-1894 French journalist
Magnus, Albert 1902