E. ACKERMAN, G. K. STROTHER AND R. L. BERGER 35 



This investigation was supported in jiaif by a giant-in-aid from the American 

 Cancer Society upon recommendation of the Committee on (Irowth of the National 

 Research Council. Portions of the work are included in theses submitted by Berger 

 and Strotlier to the Graduate School of the Pennsylvania State University in partial 

 fullfillment of the requirements for the Ph.D. degree. 



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