This paper defends a stuff theory of the chemical senses: smell and taste, unlike vision, touch, and hearing, are directly oriented toward stuffs rather than individual objects. I first argue that stuff constitutes an irreducible ontological category — distinct from both individuals and universals. I then contend, drawing on recent anti-reductionist work in the philosophy of chemistry, that chemistry itself is best understood as a science of stuffs rather than of atoms or molecules. Finally, bui