A medical doctor has graduated from an accredited school of medicine, passed board exams and completed a residency at a teaching hospital. A barrister has passed the par exam and graduated law school. Even a cosmetologist has received a relevant certification after a training course. What then, qualifies one to bear the title, "professional philosopher?" Adam Smith says, “Many improvements have been made by the ingenuity of the makers of the machines, when to make them became the business of a peculiar trade; and some by that of those who are called philosophers, or men of speculation, whose trade it is not to do any thing, but to observe every thing, and who, upon that account, are often capable of combining together the powers of the most distant and dissimilar objects in the progress of society, philosophy or speculation becomes, like every other employment, the principal or sole trade and occupation of a particular class of citizens. Like every other employment, too, it is subdivided into a great...