Small part of autograph letter signed.

Irish scientist. Original letter probably to David Brewster, sceintist, since he contributed substantially to the collection of which this was part (a collection made by his daughter-in-law). Part of letter, c.3.5 x 2". One side "Believe me, Dear Sir, / yours very truly / Dion Lardner". Other side, 21 words, talking about a "subject" and "extensive knowledge", and producing "about twelve s[heets?]", having enclosed a "specimen".