The Population Council 
One Dag Hammarskjold Plaza 
New York, New York 10017 
Cable: Popcouncil, New York 
Telephone (212)644 1300 
Telex: 234722 POCO UR 
September 25, 1984 
Dear Dr. Gartland: 
I was disappointed to read Jeremy Rifkin's letter of August 21 in 
which he requested an amendment of the NIH guidelines for recombinant 
DNA experiments to prohibit experimentation involving the transfer of a 
genetic trait from one mammalian species to another. In my view, that 
would be unduly restrictive to investigators working in the field of 
recombinant DNA research. The ability to change the genetic make-up 
of species offers incredible advantages to humankind. In my view, what 
is needed in regard to this important and promising scientific activity is 
discussion of ethics, benefits, risks and guidelines, all on a continuing 
and dynamic basis; not prohibitions. 
Dr. William Gartland 
Executive Secretary 
Recombinant DNA Advisory Committee 
National Institutes of Health 
Building 31, 3B10 
9000 Rockville Pike 
Bethesda, Maryland 20005 
Sincerely yours, 
George Zeidenstein 
[ 445 ] 
