Schleiden, Matthias Jakob, famous botanist, co-founder of cell theory, professor in Jena and Dorpat (1804-1881). Three eigh. Letters from M.J. Schleiden. 13 pp., partly very closely described. Gr. 8vo. Berlin and Jena 1837-1845. To different peers. Two of the three letters in tiny writing, so very circumferential and contentful. Extensive on topics of botany, science, study, optical technology and much more. - Partly tanned; One crack in the edge.