TY - JOUR T1 - Let's keep metaphysics out of medical ethics: a critique of Poplawski and Gillett. JF - Journal of Medical Ethics JO - J Med Ethics SP - 206 LP - 209 DO - 10.1136/jme.18.4.206 VL - 18 IS - 4 AU - F J Leavitt Y1 - 1992/12/01 UR - http://jme.bmj.com/content/18/4/206.abstract N2 - I argue that the concept of 'longitudinal form', which Poplawski and Gillett have introduced into ethical discussions about embryos and gametes, involves too many metaphysical subtleties to be a useful aid to making moral decisions. I conclude by suggesting a criterion for relevance in medical ethics. ER -