Oleum Jecoris Aselli, or cod-liver oil... had long been used by the Laplanders as a delicacy, in the Shetland Islands in place of butter, and in Holland it had been recommended as a cure for gout and rheumatism, but its first employment as a medical agent amongst us followed on the publication of Dr. Bennett's treatise on the subject.
From the Doctor's Notebook, Oleum Jecoris Aselli (p. 39), Duckworth. 1937