EHRLICH, Paul (1854-1915). Beitrge zur experimentellen Pathologie und Chemotherapie. Leipzig: Akademische Verlagsgesellschaft, 1909. 8o. Original black cloth, gilt-lettered front cover, spine lettered in blind. The first and last PRESENTATION COPIES, inscribed to Dr. Hans Sachs (1877-1945), Ehlrich's pupil, co-worker and bibliographer. FIRST EDITION. Garrison-Morton 2565; Norman 685. -- Das Sauerstoff-Bedrfniss des Organismus. Eine farbenanalytische Studie. Berlin: August Hirschwald, 1885. 8o. Original green cloth, gilt-lettered spine. Provenance: Dr. Hans Sachs (inkstamps). FIRST EDITION. Ehrlich's report of his investigations into the distribution of oxygen in animal tissues and organs, arguing that tissue oxidation and reduction use hydrogen atoms. Garrison-Morton 2540; Norman 679. -- Constitution, Vertheilung und Wirkung chemischer Koerper. Aeltere und neuere Arbeiten. Leipzig: Georg Thieme, 1893. 8o (232 x 157 mm). Contemporary half brown cloth, gilt-lettered spine, marbled boards (spine faded). Provenance: Dr. Hans Sachs (inkstamp). FIRST EDITION. A collection of papers, including descriptions of his work with methylene blue as a selective tissue stain, the use of fluorescein to observe the streaming of optic humors, and the hereditary nature of acquired immunities against toxic plant proteins in mice. Norman 682. -- EHRLICH and Adolf LAZARUS. Die Anaemie ... I. Abteilung, I. Teil: Normale und pathologische Histologie des Blutes. Edited by Adolf Lazarus and O. Naegeli. Vienna and Leipzig: Alfred Holder, 1909. 8o. 5 chromolithographed plates, chromolithographed text illustrations. Original yellow printed front wrapper bound in, contemporary half cloth, gilt-lettered spine, marbled boards. Second edition. "Ehrlich's researches on blood opened up a new era in haematology" (Norman). Heirs of Hippocrates 2157; Norman 688. Together 4 vols., 8o. (4)