Mrs. Cavendish administered a safe, but effectual, narcotic to both Mrs. Inglethorp and Mademoiselle Cynthia. 
Once sedated, Mrs. Cavendish went about the task of removing any jewelry or metal. 
mnli hypothesis: Once sedated, Mrs. Cavendish went about the task of removing any jewelry or metal.  premise: Mrs. Cavendish administered a safe, but effectual, narcotic to both Mrs. Inglethorp and Mademoiselle Cynthia. 