As the authors found that allithiamine and garlic extract were effective against acute hydrocyanic acid poisoning, their effects upon the oxygen consumption of liver slices were observed with the Warburg's manometer. Thiamine, thiamine propyldisulfide, garlic extract and other vitamins did not exhibit almost any influence on normal liver tissue respiration, but in acute hydrocyanic acid poisoning they were proved to recover the liver tissue respiration.