Miller, Orlando Jack Correspondence on the following subjects: working conditions at Columbia University College of Physicians and Surgeons; bacterial chromosomes; familial endometriosis; chromosome counts; testicular biopsies; tissue cultures; spermatogenesis in people with Down's syndrome, and Penrose's paper on translocation as the possible cause of Down's syndrome. One letter regarding chromosomes and hybridising cells, and one letter regarding the establishment of a Department of Human Genetics and Development at Columbia. 1960