This work makes a sober, thorough, carefully reasoned, and well-documented case that the prevailing theories of physics and biology have grave shortcomings which can be traced to their reliance on an underlying mechanistic framework. Dr. Thompson shows how physics is incapable of dealing with the phenomenon of consciousness and how biology is unable to account for the existence of complex living forms. Arguing that valid scientific theory does not have to be mechanistic, Dr. Thompson outlines a nonmechanistic science that would complement mechanistic science and round out the human quest for understanding. Mechanistic and Nonmechanistic Science may well set the stage for the next revolution in scientific thinking.