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In spite of the necessary limitation of this work to the consideration of a single law, it will make for exactness if I try to state the formula in a more definite fashion, without the deceptive element of simplicity. Even without being able to state in definite quantities the other factors and the co-operating laws, we may reach a satisfactory exactness by the use of a variable factor.

The first formula was only an abstract general statement of what is common to all cases of maximum sexual attraction so far as the sexual relation is governed by the law. I must now try to find an expression for the strength of the sexual affinity in any conceivable case, an expression which on account of its general form, can be used to describe the relationship between any two living beings, even if these belong to different species or to the same sex.

If

χ {

α Mα´ W

and

γ {

β Wβ´ M

χ { α M and γ { β W α´ W β´ M

(where α, α´, β, and β´ are each greater than 0 and less than unity) define the sexual constitutions of any two living beings between which there is an attraction, then the strength of the attraction may be expressed thus: