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They found that if they cleaned an infected wound with chemicals such as carbolic acid, bromine, nitric acid, and iodine, they could sometimes heal it.

The wounds were cauterized with carbolic acid and sterilized with alcohol.

An Indian government commission was tasked with investigating, and it discovered that Haffkine had changed the procedure for sterilising the plague vaccine, using heat instead of carbolic acid because it sped up production.

Apparently it's an obsolete term referring to the use of carbolic acid as a disinfectant to kill germs.

Starting with Chinatown, earthen basements were concreted, concrete ones flooded with carbolic acid, walls washed with lye, streets asphalted, cesspools filled and decrepit dwellings demolished.