An Original Handwritten Letter Signed by Poet Charles Mackay. Dated 1875. A long letter discussing his work, copywrite, his work with a Bishop and Lord Napier. Charles Mackay 1814-1889 was a Scottish poet, journalist, author, and songwriter, remembered mainly for his book Extraordinary Popular Delusions and the Madness of Crowds. Size is 175mm x 112mm. Condition is good. Light folding crease. Light age toning.