112 Wisconsin Academy of Sciences, Arts and Letters. 
bership of on© thought may also (a) at some other moment, or 
.(b) at the same moment, serve in, case (1) the same, or case 
(2) any other, membership of another thought. 
The possibilities of (a), exemplified by “I am fond of red. 
My wife likes red. Eed is a beautiful color. My house is 
red/ 7 are too well known to admit discussion. 
Case (1) or double service, as a single part of speech, has 
been considered in the examination of relatives, and is, more¬ 
over, foreign to the purpose of the moment. 
Case (2) implies that a word may, at the same time, serve 
not only as a given part of speech, but also as any other part of 
speech—or rather, such would be the implication, if each of 
the reputed parts of speech exactly tallied with a single kind 
of membership in thought. 
Were such exactness realized, and if every one of the parts 
of speech in actual practice hybridized with every other, the 
number of hybrids would be very great. Of the accepted parts 
of speech—say nine in number—one may hybridize with each 
of the remaining eight; one of the remaining eight with each 
of the remaining seven; and so on, till completion of the series, 
eight, seven, six, five, four, three, two, and one, which make a 
total of thirty-six. 
Every hybridization may, moreover, occur in either of two 
ways, producing two different forms. Just as the offspring of 
horse and ass is of one sort when sired by the horse, and of 
another when sired by the ass, so also the hybrid of two parts 
of speech,—for intance, verb and noun—is of one sort when in 
dominant thought a noun and in subordinate thought a verb, 
and of another sort when these conditions are reversed. This 
difference, once admitted as distinctive, brings the number of 
possible hybrid parts of speech to seventy-two. 6 
6 Whether further breeding occurs between type and hybrid, I ex¬ 
amine later (pages 202-3). 
