[Lyon Playfair, Scottish scientist and Liberal politician.] Autograph Signature on cover of envelope franking a letter to the London publishers George Routledge & Sons.

On the 8 x 13cm cover of the envelope. In fair condition, on lightly-aged paper, with loss at head and to top right-hand corner from removal from an album, traces of which adhere to the reverse. Playfair's signature ('Lyon Playfair') in the bottom left-hand corner is unnaffected, and the address, also in his hand, reads: 'Messrs George Routledge & Son | Broadway | Ludgate Hill | E.C.' The orange circular franking postmark is incomplete, and reads: 'LON | OFF | PAID | B | 9 FE 86'.