of human emotions is fear. Man comes into the world weak and naked, and almost as devoid of intelligence as an oyster, but he brings with him a highly complex and sensitive susceptibility to fear. He can tremble and cry out in the first hours of his life—nay, in the first minute. Make a loud noise behind an infant just born, and it will shake like a Sunday-school superintendent taken in adultery. Take away its support—that is, make it believe that it is falling—and it will send up such a whoop as comes from yokels when the travelling tooth-puller has at them. These fears, by their character, suggest that they have a phylogenic origin—that is, that they represent inherited race experience, out of the deep darkness and abysm of time. Dr. John B. Watson, the head of the behaviourist school, relates them to the daily hazards of arboreal man—the dangers presented by breaking tree branches. The ape-man learned to fear the sudden, calamitous plunge, and he learned to fear, too, the warning crack. One need not follow Dr. Watson so far; there is no proof, indeed, that man was ever arboreal. But it must be obvious that this emotion of fear is immensely deep-seated—that it is instinctive if anything is
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