Haldane guesses that a dog would probably be able to place the acids in the order of their molecular weights by their smells, just as a man could place a number of piano wires in the order of their lengths by means of their notes.
Haldane va intuir que un gos probablement seria capaç d'ordenar els àcids segons els seus pesos moleculars per les seves olors, així com un home podria ordenar les cordes d'un piano segons les seves longituds sentint les seves notes.