Rising in the scale of activity, we come to senna, the infusion of which acts with much energy, and is well calculated for cases of obstinate constipation. An ounce of it may be given infused in a pint of boiling water; the liquid being allowed to cool to the proper temperature. The Edinburgh Cathartic Enema (Enema Catharticum, Ed.) consisted of a pint of senna tea, made with half an ounce of the senna, but with the addition of an ounce of olive oil, half an ounce of sulphate of magnesia, and an ounce of sugar.