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44 call these individuals “compulsion neurotics” he would find the term “taboo disease” quite appropriate for their malady. Psychoanalytic investigation has taught him the clinical etiology and the essential part of the psychological mechanism of this compulsion disease, so that he cannot resist applying what he has learnt there to explain corresponding manifestations in folk psychology.

There is one warning to which we shall have to give heed in making this attempt. The similarity between taboo and compulsion disease may be purely superficial, holding good only for the manifestations of both without extending into their deeper characteristics. Nature loves to use identical forms in the most widely different biological connections, as, for instance, for coral stems and plants and even for certain crystals or for the formation of certain chemical precipitates. It would certainly be both premature and unprofitable to base conclusions relating to inner relationships upon the correspondence of merely mechanical conditions. We shall bear this warning in mind without, however, giving up our intended comparison on account of the possibility of such confusions.

The first and most striking correspondence between the compulsion prohibitions of neurotics and taboo lies in the fact that the origin of these