"It is not an exaggeration to say that the discovery of penicillin has saved millions of lives."

"If penicillin can cure those that are ill, Spanish sherry can bring the dead back to life."

"It is not wise to use penicillin as a prophylactic against every little infection."

"The medical profession has a great responsibility in seeing that penicillin is used wisely."

"It is not difficult to make microbes resistant to penicillin in the laboratory by exposing them to concentrations not sufficient to kill them."