Paré was a keen observer and did not allow the beliefs of the day to supersede the evidence at hand. In his autobiographical book, "Journeys in Diverse Places", Paré inadvertently practiced the scientific method when he returned the following morning to a battlefield. He compared one group of patients who were treated in the traditional manner with boiling elder oil and cauterization, and the remainder with a recipe made of egg yolk, oil of roses and turpentine, and left overnight. Paré discovered that the soldiers treated with the boiling oil were in agony, whereas the ones treated with the ointment had recovered because of the antiseptic properties of turpentine. This proved this method's efficacy, and he avoided cauterization thereafter. However, treatments such as this were not widely used until many years later. He published his first book "The method of curing wounds caused by arquebus and firearms" in 1545.