April 4, 1969

Dr. Paul Ehrlich
Blology

Joshua Lederberg

Dear Paul:

I only just stumbled into the fact that you have been interested in
fluctuating aasymmetry. it had occurred to me that we ought to try to
construct a teratology index as a way of monitoring maternal health,
and the possible impact of chemical agents in the environment. I have,
however, not been able to find very much quantitative information on
the incédence of minor asymmetry in man or other animals, nor on its
relationship to things like maternal age that might be cues to ite
utility. If you know anything about this, would you let me know.