Science writer Jay Ingram calls consciousness "an immaterial thing," seeming to rule it outside the scope of science -- even as he details score upon score of scientific glimpses into it. So he turns to genuflect now and then toward the old masters, even as he marches away from them. Gradually, consciousness really does begin to look like the last remnant of an official mystery formerly packaged under the opaque heading of "the soul." As this mystery dissolves, it is replaced by a more complex picture of our musings, dreamings, rememberings, forgettings and wonderings. Ingram, as always, delivers the goods in a manner that is readily accessible -- and a lot of fun.