INTRODUCTION.
There is a passion, or a perversion of appetite, which, like all human passions, has played a considerable part in the world's history for good or evil; but which has hardly yet received the philosophical attention and the scientific investigation it deserves. The reason of this may be that in all Christian societies the passion under consideration has been condemned to pariahdom; consequently, philosophy and science have not deigned to make it the subject of special enquiry. Only one great race in past ages, the Greek race, to whom we owe the inheritance of our ideas, succeeded in raising it to the level of chivalrous enthusiasm. Nevertheless, we find it present everywhere and in all periods of history. We cannot take up the religious books, the legal codes, the annals, the descriptions of the manners of any nation, whether large or small, powerful or feeble, civilised or savage, without meeting with this passion in one form or other. Sometimes it assumes the calm and dignified attitude of conscious merit, as in Sparta, Athens, Thebes. Sometimes it skulks in holes and corners, hiding an abashed head and shrinking from the light of day, as in the capitals of modern Europe. It
