Bernard Williams feels that too great a distinction has been made in recent philosophy between the concerns of the philosopher and those of the physicist. There are too many ways, he says, in which... each discipline supplements each other and in ths discussion with astrophysicist Dennis Sciama he explores how problems related to the nature of time can be jointly faced. Sciama argues that many of the seeming paradoxes concerning time, which result from some solutions to Einstein's equations of relativity, are not necessarily illogical. The abandonment of the ideas of simultaneity and irreversibility still leave the physicist with a useful concept of time. Whether this altered concept is acceptable to philosophers is the main point of the discussion.