 Pasteur objects strongly, saying the soil is full of anthrax spores, and eventually an experiment is proposed.He will vaccinate 25 of the newly arrived sheep; then they and a control group of 25 others will be injected with blood from a sheep with anthrax.Joseph Lister (Halliwell Hobbes), the pioneer of antiseptic surgery in England, is interested enough to attend, and witnesses Pasteur's total success as all the vaccinated sheep remain healthy after the other 25 have died.