DISCUSSION 
equivalent of a Shakespeare, a Newton or even a Rudolph 
Valentino to father their offspring. 
Medawar: I think the question of freezing sperm is irrelevant 
to the eugenic principles that Muller is trying to propagate. 
The reason why he has now adopted the idea of preserving 
sperm is to meet the criticism justly made by Dr. L. C. Dunn, 
that Muller himself has changed the composition of the select 
list of sperm donors whom he would choose to father a high 
proportion of succeeding generations. As Muller’s opinions 
have changed, so the list of preferred donors has changed. This 
is only one of many objections to Muller’s scheme. 
Klein: Muller has certainly changed his opinions; twenty 
years ago, in his book Out of the Night, he asked: where is 
the woman who would not be eager and proud to have in her 
womb a product of Lenin or Darwin? I don’t think Muller 
would put Lenin and Darwin together now. 
Huxley: The point about deep-frozen sperm is surely that it 
is a technical device to secure multiple, and therefore quickly 
effective, selection. As for Muller changing his mind, I think 
he has changed it in the right direction. He has left the choice 
now, I think rightly, to the parents themselves. What we ought 
to do is to plant ‘“‘Seeds of the Future”’ in this field—a few 
experiments in which parents would be able to choose the 
donors for their children. At present, I understand that in 
artificial insemination by a donor the parents are not allowed 
to know who the donor of the sperm is. Donors should all be 
registered and parents should have a possibility of choosing. 
This could be extended to a multiple choice system. 
Dr. Pincus said that it would be easier to get homozygosity 
by parthenogenesis. But do we want homozygosity? As a 
eugenist, I certainly don’t. Surely the hybrid vigour, due to 
heterozygosity, of the human species is highly important, and 
there is no reason why one should not get general improvement 
in the level of various desirable characters without fixing any 
one of them, as you try to fix characters in a breed of dogs. 
Haldane: 1 agree with Muller when he said that in most 
existing societies effective fertility is negatively correlated with 
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