“…The "pharmacology and toxicology of tetrachlorethylene," addressed by Lamson et al (16), was a timely topic in the 1920s, when hookworms and other intestinal worms were still common in much of this country as well as in the less developed parts of the world. The commonly used vermifuges of the day, carbon tetrachloride and oil of chenopodium, were toxic, and safer alternatives were badly needed.…”