Zellen-Studien: Heft 5: Ueber die Abhangigkeit der KerngroBe und Zellenzahl der Seelgel-Larven von der Chromosomenzahl der Ausgangszellen. : Heft 6. Die Entwicklung dispermer Seeigel-Eler. Ein Beitrag zur Befruchtungslehre und zur Theorie des Kerns

Jena: Verlag Von Gustav Fischer. Very Good with no dust jacket. 1st Ed, 1st Prtg. Hard Cover. Two volumes bound as one in red cloth with faded gilt lettering. Tear on side of spine and both top & bottom worn. Heft 5: (1904) 80 pp. with two beautiful fold-out lithographs and 7 text figures. Heft 6 (1907) IV + 290 pp. plus 73 text figures and 10 fold-out lithographs. E. Mayr in The Growth of Biological Thought writes "Nothing in the cytological advances made before and after 1900 was more important in the history of genetics than the demonstration of the individuality and continuity of chromosomes...[p.747] There is no doubt that Boveri, more than anyone else, supplied the decisive proof for the theory chromosome individuality." [p. 748] Henry Harris [The Birth of the Cell] adds that Boveri's "..experiments marked a major transition in methodology. Prior to Boveri, analysis of cellular components was based either on theory, as in the case of Weisman, or on minute microscopic examination of selected cells and tissues, as in the case of Flemming. With Boveri the science of cell biology moved from observation and deduction to manipulative experimentadon. p. 170" Baltzer [Theodor Boveri: The Life of a Great Biologist 1862-1915] describes Heft 6 as the "final, extremely comprehensive report of the decisive experiments carried out by Boveri the winter of 1901-1902 and in the spring of 1905." .