Botany Conwentz, H Monograph of the Baltic amber trees. Comparative studies on the vegetation organs and flowers, as well as on the resin and diseases of the Baltic amber trees. With 18 full-page lithographs, some in colour. Gdansk, Wilhelm Engelmann, 1890. 3 vols. 151 pp. Folio. Cloth. (rubbed and bumped, stained). Only edition. - Very rare. - With bookplate and hs. Owner's note by Erich Stock. - A reconstruction of the extinct coniferous tree from which the Baltic amber deposits were formed. The microscopic-morphological findings of the German botanist Hugo Conwentz were reproduced on the 18 magnificent plates. - Each plate is preceded by a leaf with explanatory notes. - Some foxing, margins browned. Overall a well-preserved copy. Botany. - With 18 full-page lithographs, some in colour. Canvas (rubbed and bumped, stained). - Only edition. - Very rare. - With exlibris and handwritten ownership note by Erich Stock. - A reconstruction of the extinct conifer from which the Baltic amber deposits were formed. The microscopic-morphological findings of the German botanist Hugo Conwentz were reproduced on the 18 magnificent plates. - Each plate is preceded by a leaf with explanatory notes. - Some foxing, margins browned. Overall a well-preserved copy.