n (say Mr. Jones) wishes to speak collectively of himself and his wife, the order of mentioning the terms in the class considered and the names applied to

. Jones

) and my wif

wife

or me) and

ere a member of the upper, upper middle, or lower class; while form (4) is only used by retired shopkeepers of the lower middle-class, of which a male member usually combines belief in the supremacy of man with belief in the dignity of his wife as well as himself. A further

three classes of males, females, and dead people, we can define "wife" (a female who has the relation formed by taking the relative product of P and P?[36] to a male), "sister," "deceased wife," and "deceased wife's sister" in terms of these ideas and of the fundamental notions of logic. Then the proposition "No man marries his deceased wife's sister" can be expressed unambiguously by about twenty-nine simple sig

r example, the logical interpretation of "The father of Charles II was executed" is, "It is not always false of x that x begat Charles II, and that x was executed and that 'if y begat Charles II, y is identical with x' is always true of y.

Chapter X

notation for the rel

N. S., vol. xiv., O

cf. M., vol. xxii., 1912, p. 153. [This essay is reprinted in