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Rh is at the basis of the observance of the taboo.

We may ask what we have gained from the comparison of taboo with compulsion neurosis and what value can be claimed for the interpretation we have given on the basis of this comparison? Our interpretation is evidently of no value unless it offers an advantage not to be had in any other way and unless it affords a better understanding of taboo than was otherwise possible. We might claim that we have already given proof of its usefulness in what has been said above; but we shall have to try to strengthen our proof by continuing the explanation of taboo prohibitions and customs in detail.

But we can avail ourselves of another method. We can shape our investigation so as to ascertain whether a part of the assumptions which we have transferred from the neurosis to the taboo, or the conclusions at which we have thereby arrived can be demonstrated directly in the phenomena of taboo, We must decide, however, what we want to look for. The assertion concerning the genesis of taboo, namely, that it was derived from a primitive prohibition which was once imposed from without, cannot, of course, be proved. We shall therefore seek to confirm those