At Endell, Anderson and the hospital pathologist, Helen Chambers, pioneered a new method of treating septic wounds, an antiseptic ointment called BIPP (bismuth, iodoform, and paraffin paste). The paste had been invented by James Rutherford Morison. After positive results from some initial tests by Anderson, Morison asked her and Chambers to run a larger trial of BIPP in 1916.