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 supõe que um cachorro seria capaz de colocar os ácidos em ordem de peso molecular usando o cheiro, assim como um homem colocaria as cordas de um piano em ordem de comprimento baseado nas notas musicais.