At head of title: University of Pennsylvania. Bicentennial conference.
Contents:
Chromosomes and heredity: The nature of the gene, by M. Demerec. Chromosome structure, by C. W. Metz. The sex chromosomes: heteropycnosis and its bearing on some general questions of chromosome behavior, by Franz Schrader.--Cytogenetics and evolution: Chromosomal interchanges, by A. F. Blakeslee. Chromosomal differences between races and species of Drosophila, by Th. Dobzhansky. Evolution of the germplasm, by C. E. McClung.--Cytology and genetics of protozoa: Hereditary status of the rhizopods, by H. S. Jennings. Nuclear behavior and reproduction in ciliated protozoa, by W. F. Diller. Inheritance in ciliated protozoa, by T. M. Sonneborn.--Physiology of the nucleus: The physico-chemical properties of the nucleus, by Leon Churney. The chromosomes of the amphibian nucleus, by W. R. Duryee. Radiation and the cell nucleus, by P. S. Henshaw
