I don't think any one person was first to make this observation (and I would think of it more as an observation that argument). Notice that classification has a mataphorical aspect. Whoever 'first' spoke of mammals had noticed that rabbits are foxes and chipmunks are elephants and they are all hyenas (at least from one aspect -- and that is all a metaphor ever does, it asserts that A is B _in respect to Q_).
Carrol ^^^^^ CB: Or a is to b as x is to y: a:b::x:y Algebra is metaphoric; metaphors are algebraic : 1/2 = 2/4
