In the 16th century, a Swiss - born physician commonly known as Paracelsus made chickens breathe sweet vitriol and noted that they not only fell asleep but also felt no pain.
16. sajandil lasi Šveitsi päritolu arst, keda enamasti tuntakse Paracelsuse nime all, kanadel magusat vitriolõli sisse hingata ning märkas, et see kutsub kanadel esile une ning valutundetuse.