384 F, W. STAHL 



Acknowledgments 



The author is deeply indebted to all those who have given so freely of their unpub- 

 lished experiments and ideas. Mrs. M. Chase Epstein, IVIr. C. M. Sternberg, and Drs. 

 A. H. Doermann, D. R. Krieg, R. H. Epstein, W. Harm, and A. D. Hershey have been 

 most generous in this respect. A very special debt of gratitude is owed to Dr. N. A. 

 Barricelli, who made available to me two unpublished manuscripts summarizing many 

 of his thoughts on the radiobiology of T4; they have been extremely valuable in the 

 preparation of this review. 



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