What should we make of Naturalist's efforts to explain language and mental states in acceptably naturalistic ways? What does it mean to say that intentionality and conceptual content are perfectly natural? What is there to commend Naturalism to us in it own right? Alston begins by attempting to clarify just what it would mean for a given phenomenon to be described in strictly naturalistic terms, concluding that establishing such criteria is itself difficult. The problem in part is a tendency to allow naturalism to permit any phenomena whatsoever within its ken, a license that Alston characterizes as a kind of "blank check". Unable to find the necessary criteria, Alston settles on: nature is, "by definition, to include all and only what is discoverable by the 'scientific method', including the incipient beginnings of this in ordinary sensory observation, and reasoning from the results of observation." Given such a definition, Alston proceeds to ask the epistemological question of why we should think that science is the only purveyor of knowledge. ~ Afterall