RARE FIRST EDITION of the ENGLISH TRANSLATION of an important treatise by the renowned German biologist Theodor Heinrich Boveri (1862-1915), in which he argues that malignant tumors might be the result of a certain abnormal condition of the chromosomes, which may arise from from multipolar mitosis, translated by his wife, the American biologist Marcella Boveri (O`Grady) (1863-1950). 205x140mm. IX+119 pages (+5). Blue cloth Hardcover with gilt spine. Cover slightly stained. Scratch-mark on front cover. Cover corners and bottom edge rubbed. Spine edges bumped and rubbed. Binding slightly visible between pages 22-23, 70-71 and 110-111. Pages III-4 bottom part detached from binding. Previous owner`s stamp on pre-title page, and pages V and 71 upper edge. Rear commercial page edge slightly (20mm) torn. Pages yellowing. [SUMMARY]: This extremely rare English edition of a pioneering work in tumor research is otherwise in good condition.