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 menebak bahwa seekor anjing mungkin bisa menempatkan asam-asam itu sesuai urutan berat molekulnya sesuai dengan bau masing-masing, sama seperti manusia bisa membedakan sejumlah kawat piano sesuai urutan panjangnya berdasar nada yang mereka hasilkan.