Aethusa Cynapium, Fool's Parsley, is generally regarded as being highly toxic, but has not been adequately investigated. In small doses it has long enjoyed some reputation in the gastro-intestinal catarrh of bottle-fed babies. It appears to act best when the trouble is incidental to irritation of the nervous system.

While it cannot be regarded as a thoroughly reliable remedy, and without antiseptics in alternation with it usually dismally fails, yet it appears that I I doses of the first decimal dilution in alternation with 1-1000 grain doses of arsenite of copper is a fairly efficient treatment.