Abstract

The author is especially indebted to Dr. H. H. Keasling of the Department of Pharmacology at the State University of Iowa for his aid in developing the dog-head cross circulation experiment. He wishes, also, to thank Dr. Jack Hummel for determining the infrared spectra and Drs. H. M. Hines, W. R. Ingram, J. Davies and F. M. Skultety (of the State University of Iowa College of Medicine) for much good advice during the course of this investigation. He wants to thank Dr. Jack Carter and the Department of Pathology at the State University of Iowa for preparing the slides and carrying out the histologic examination of the rat brains and Drs. E. G. Gross, R. M. Featherstone, and C. C. Pfeiffer for reading and criticizing the manuscript.