"La premiere chose qui s'offre a l' Homme quand il se regarde, c'est son corps," says Pascal, and looking at the matter more closely we find that it was the strange and mysterious things of his body that occupied man's earliest as well as much of his later attention. In the beginning, the organs and functions of generation, the mysteries of sex, not the routine of digestion or of locomotion, stimulated his curiosity, and in them he recognized, as it were, an unseen hand reaching down into the world of matter and the workings of bodily organization, and reining them to impersonal service and far-off ends. All ethnologists and students of primitive religion well know the role that has been played in primitive society by the genetic instincts. Among the older naturalists, such as Pliny and Aristotle, and even in the older historians, whose scope included natural as well as civil and political history, the atypic and bizarre, and especially the aberrations of form or function of the generative organs, caught the eye most quickly. Judging from the records of early writers, when Medicine began to struggle toward self-consciousness, it was again the same order of facts that was singled out by the attention. The very names applied by the early anatomists to many structures so widely separated from the organs of generation as were those of the brain, give testimony of the state of mind that led to and dominated the practice of dissection. In the literature of the past centuries the predominance of the interest in the curious is exemplified in the almost ludicrously monotonous iteration of titles, in which the conspicuous words are curiosa, rara, monstruosa, memorabilia, prodigiosa, selecta, exotica, miraculi, lusibus naturae, occultis naturae, etc., etc. Even when medical science became more strict, it was largely the curious and rare that were thought worthy of chronicling, and not the establishment or illustration of the common, or of general principles. With all his sovereign sound sense, Ambrose Pare has loaded his book with references to impossibly strange, and even mythologic cases. In our day the taste seems to be insatiable, and hardly any medical journal is without its rare or "unique" case, or one noteworthy chiefly by reason of its anomalous features. A curious case is invariably reported, and the insertion of such a report is generally productive of correspondence and discussion with the object of finding a parallel for it.