In the epistemological spirit of trying to make (human) order out of (natural) disorder, this ambitious book attempts to trace the logic-oriented striving of psychology and psychiatry to apply observation, statistics, and logic to the chaotic phenomena of the mentally ill mind. For Americans, the use of British spellings ("behaviour") and grammatical constructions ("the latter became subject to much philosophical stick") may be distracting. For believers in biological underpinnings, descriptions such as, "The person appears to have nothing to be depressed about, or can think of no reason to be depressed," may elicit head-shaking outrage. Clinicians seeking research or even anecdotal evidence of best practices will be entirely disappointed because these pages offer abstractions only and no immediately applicable hypotheses or data. However, if the reader is open-hearted and willing to adventure into the overlapping realms of theoretical philosophy and medical nosology, then there may be surprising rewards at the conclusion. Initial familiarity with the treatises of Plato, Michel Foucault, Karl Jaspers, Wittgenstein, Hume, and Thomas Szasz will be helpful, as will a schematic overview of neurobiology.