o, on 2 folio sheets laid one inside the other, text in left column, revisions on right side (one page neatly repaired at center fold). " /> HELMHOLTZ, Hermann von (1821-1894). Autograph draft manuscript signed ("H. Helmholtz"), pages 461-464 of his paper "ber die Theorie der zusammengesetzten Farben." [Knigsberg, 1852]. With revisions and emendations in his hand. 8 pages, 4<V>o, on 2 folio sheets laid one inside the other, text in left column, revisions on right side (one page neatly repaired at center fold). | Christie's