Melinda A. Roberts and David T. Wasserman 1 Purpose of this Collection What are our obligations with respect to persons who have not yet, and may not ever, come into existence? Few of us believe that we can wrong those whom we leave out of existence altogether--that is, merely possible persons. We may think as well that the directive to be "fruitful, and multiply, and replenish the earth" 1 does not hold up to close scrutiny. How can it be wrong to...