PREFACE 



selected the illustrative material and examples that seemed most suit- 

 able and familiar to him. The result can hardly seem to have the ideal 

 balance to all the scientific areas now interested in transport. Perhaps 

 physiologists and pharmacologists would like to read more about the 

 intricacies of ion transport, the physical and mathematical biologists 

 more of the theoretical background, the cytolooists more about the 

 morphological substratum, and so on. Although all divergent needs 

 cannot be met, I trust this summary will prove useful to both teach- 

 ing and learning in various disciplines. 



Thanks are due my present collaborators, Dr. Hitoshi Akedo 

 and Dr. Dale L. Oxender; to numerous former collaborators for their 

 participation in my attempt to understand transport phenomena; and 

 to Dr. A. Baird Hastings and Dr. W. D. Stein for their helpful com- 

 ments on the manuscript. I also want to thank authors who have 

 kindly agreed to my use of figures and quotations from their writings. 



H. N. Christensen 

 Ann Arbor, Michigan 

 May 1,1962 



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