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 soudí, že pes je nejspíš schopen ty kyseliny čichem seřadit podle jejich molekulární hmotnosti, tak jako by člověk podle tónů dokázal seřadit struny klavíru do pořadí podle jejich délky.