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Rh is necessary for the investigation is possessed by every one.

I have come to the law which I shall now formulate by a method the validity of which I shall now have to prove. The law runs as follows: "For true sexual union it is necessary that there come together a complete male (M) and a complete female (F), even although in different cases the M and F are distributed between the two individuals in different proportions."

The law may be expressed otherwise as follows: If we take &mu;, any individual regarded in the ordinary way as a male, and denote his real sexual constitution as M&mu;, so many parts really male, plus W&mu;, so many parts really female; if we also take &omega;, any individual regarded in the ordinary way as a female, and denote her real sexual constitution as W&omega;, so many parts really female, plus M&omega;, so many parts really male; then, if there be complete sexual affinity, the greatest possible sexual attraction between the two individuals, &mu; and &omega;,

(1) M&mu; (the truly male part in the "male") + M&omega; (the truly male part in the "female") will equal a constant quantity, M, the ideal male; and

(2) W&mu; + W&omega; (the ideal female parts in respectively the "male" and the "female") will equal a second constant quantity, W, the ideal female.

This statement must not be misunderstood. Both formulas refer to one case, to a single sexual relation, the second following directly from the first and adding nothing to it, as I set out from the point of view of an individual possessing just as much femaleness as he lacks of maleness. Were he completely male, his requisite complement would be a complete female, and vice versa. If, however, he is composed of a definite inheritance of maleness, and also an inheritance of femaleness (which must not be neglected), then, to complete the individual, his maleness must be completed to make a unit; but so also must his femaleness be completed.