CONTENTS 



Contributors v 



Foreword ix 



Preface xi 



\ Part I. Effects of Ionizing Radiation on the 



Developing Nervous System 



Introduction to Part I 



By Samuel P. Hicks 1 



Major Radiobiolotjical Concepts and Effects of Ionizing Radiations 

 on the Embryo and Fetus 



By Roberts Rugh 3 



Quantitative Histologic and Behavioral Studies on Effects of Fetal 



X-Irradiation in Developing Cerebral Cortex of White Rat 



By K. R. Brizzee, L. A. Jacobs, X. Kharetchko, and 



J. C. Sharp 27 



Structural and Behavioral Alteration in the Rat Following Cumula- 

 tive Exposure of the Central Nervous System to X-Irradiation 



By Robert H. Brownson 41 



Behavioral and Histologic Effects of Head Irradiation 

 in Newborn Rats 



By James N. Yamazaki, Leslie R. Bennett, and Car- 

 mine D. Clemente 59 



Cytoplasmic Inclusions Containing Deoxyribonucleic Acid in the 

 Neural Tube of Chick Embryos Exposed to Ionizing Radiation 



By Mary Elmore Sauer and Donald Duncan 75 



Biochemical Effects of Irradiation in the Brain of the Neonatal Rat 

 By O. A. Schjeide, J. N. Yamazaki, C. D. Clemente, 



Nancy Ragan, and Sue Simons 95 



Some Effects of Nucleic Acid Antimetabolites on the Central Nerv- 

 ous System of the Cat 



By Harold Koenig 109 



Geographic Distribution of Multiple Sclerosis in Relation to 

 Geomagnetic Latitude and Cosmic Rays 



By John S. Barlow 123 



xiii 



