What is Gratiola and by whom introduced ? It is the hedge hyssop . A pathogenesis is found in Hartlaub & Trink's Materia Medica . Tincture from the fresh plant gathered before flowering. Imported. What is the chief action of this remedy ? In gushing, watery diarrhoea, coming out like water from a hydrant ; the stools are yellowish-green and frothy, and associated with a cold feeling in the abdomen. How does Croton tiglium compare here ? It also has yellow, watery stools coming as from a hydrant ; but there is much nausea with it.