It is impossible to understand completely any human being or any single act of his behavior, just as it is impossible to understand completely why a particular wild rose bloomed under a particular hedge at a particular moment. A complete understanding in either case would imply an understanding of all cosmic processes, of their interrelations and sequences. But it is not harder to comprehend the behavior of the "unadjusted" or "delinquent" person, say the vagabond or the prostitute, than that of the normally adjusted person, say the business man or the housewife. In either case we realize that certain influences have been at work throughout life and that these are partly inborn, representing the original nature of man, the so-called instincts, and partly the claims, appeals, rewards, and punishments of society,the influences of his social environment. But if we attempt to determine why the call of the wild prevails in the one case and the call of home, regular work, and "duty" in the other, we do not have different problems but aspects of the same general problem. It is only as we understand behavior as a whole that we can appreciate the failure of certain individuals to conform to the usual standards. And similarly, the unrest and maladjustment of the girl can be treated only as specifications of the general unrest and maladjustment. In this connection students of psychology and education have been particularly interested in determining what the inborn tendencies really are. There was however no scientifically controlled work on the point until Watson undertook his experiments on newborn babies. At the time his work was interrupted he had found only three "instincts" present in the child at birth: We are inclined now to believe that the fundamental emotional reactions can be grouped under three general divisions: those connected with fear; those connected with rage; those connected with what, for lack of a better term, we may call joy or love. These at least deserve the name of major emotions. Whether or not other types of emotional reactions are present we cannot yet determine.... The principal situations which call out fear responses are as follows: (1) To suddenly remove from the infant all means of support, as when one drops it from the hand to be caught by an assistant.... (2) By loud sounds. (3) Occasionally when an infant is just falling asleep the sudden pulling of the blanket upon which it is lying will produce the fear response. (4) Finally, again, when the child has just fallen asleep or is just ready to awake a sudden push or a slight shake is an adequate stimulus. The responses are a sudden catching of the breath, clutching randomly with the hands (the grasping reflex invariably appearing when the child is dropped), blinking of the eyelids, puckering of the lips, then crying; in older children, flight and hiding.