Exsanguination occur. However, the animal's inverted position allows blood to flow more precipitously and thus makes an animal regaining consciousness before it is fully exsanguinated highly unlikely. In any case, animal welfare advisory councils clearly emphasize that the time from incapacitation to start of exsanguination should be prompt; recommending a time under 15 seconds. Beyond the initial cost of purchasing a captive bolt, continued usage of the method is very inexpensive. The animal is incapacitated for the duration of the procedure, so it is one of the safest methods for the slaughterer. Slaughter by exsanguination is mandated by Judaic kashrut (kosher)
History of scientific method authority of others. Knowledge must be based on experience. In the mid-19th century Claude Bernard was also influential, especially in bringing the scientific method to medicine. In his discourse on scientific method, "An Introduction to the Study of Experimental Medicine" (1865), he described what makes a scientific theory good and what makes a scientist a true discoverer. Unlike many scientific writers of his time, Bernard wrote about his own experiments and thoughts, and used the first person. William Stanley Jevons' "The Principles of Science: a treatise on logic and scientific method" (1873, 1877) Chapter XII "The Inductive or Inverse Method",