Exsanguination itself originated from Latin: "ex" ("out of") and "sanguis" ("blood"). Exsanguination is used as a method of slaughter. Before the fatal incision is made, the animal may be rendered insensible to pain by various methods, including captive bolt, electricity or chemical. Without prior sedation, stunning or anesthetic, this method of slaughter causes a high degree of anxiety, although other religiously funded studies contradict these findings. The captive bolt is placed against the skull of the animal, and penetrates to cause tissue destruction in the brain, incapacitating the animal so that the procedure may take place. Electricity is used mostly to
History of scientific method by revising what the search for knowledge, particularly physical knowledge, might be. The first of these, philosopher and physician Francisco Sanches, was led by his medical training at Rome, 1571–73, to search for a true method of knowing ("modus sciendi"), as nothing clear can be known by the methods of Aristotle and his followers — for example, 1) syllogism fails upon circular reasoning; 2) Aristotle's modal logic was not stated clearly enough for use in medieval times, and remains a research problem to this day. Following the physician Galen's "method of medicine", Sanches lists the methods of judgement and experience,