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. gadsimtā šveiciešu ārsts, kas plaši pazīstams ar Paracelza vārdu, deva cāļiem to ieelpot un ievēroja, ka cāļi ne tikai iemiga, bet arī nejuta sāpes.