PART 1．GENERAL SURVEY AND INTERPRETATION OF EFFECTS＆Chairman:L．H．GRAY 1
Introduction＆L．H．GRAY 3
Chromosome Abberrations and Target Theory＆H．J．EVANS (Extended comments by S．WOLFF) 8
Chromatid Aberrations－The Generalized Theory＆S．H．REVELL 41
Numbers of Nuclear Sites for Aberration Formation and the Distribution of Aberrations＆K．C．ATWOOD 73
PART 2．BIOCHEMICAL NATURE OF INDUCED ABERRATIONS＆Chairman:J．TOTTER 87
Introduction＆J．TOTTER 89
Survey of Work on Chemical Bonds Involved in Aberrations＆C．P．SWANSON 90
Aberrations Induced by Radiomimetic Compounds and Their Relations to Radiation-Induced Aberrations＆B．A．KIHLMAN 100
Radioisotope Studies on the Structure of the Chromosome＆J．H．TAYLOR (Extended comments by M．J．MOSES) 123
PART 3．BIOPHYSICAL STUDIES OF CHROMOSOME ABERRATIONS＆chairman:G．H．NEARY 165
Chromosome Aberrations and Free Radicals＆A．D．CONGER (Extended comments by E．J．HART and R．CALDECOTT) 167
Effects of Combined UV and X Radiations on Chromosome Breakage in Tradescantia Pollen＆J．S．KIRBY-SMITH 203
PART 4．ABERRATIONS OF HUMAN CHROMOSOMES AND THEIR MEDICAL IMPLICATIONS＆Chairman:N．H．GILES,JR． 215
Dose Relations in the Induction of Human Chromosome Aberrations＆E．H．Y．CHU 217
Chromosome Cytology of Medical Anomalies＆G．YERGANIAN 237
PART 5．GENETIC CONSEQUENCES OF ABERRATION INDUCTION＆Chairman:A．H．SPARROW 271
General Survey of Genetic Effects of Chromosomal Aberrations＆D．L．LINDSLEY 273
Summary＆C．AUERBACH 290