A glass of water on going to bed or on getting up has a laxative effect; and there are other dietary measures which may be employed with advantage. Thus, coarseness of the food, as we know, stimulates intestinal activity, and this fact explains the peculiar value of Graham bread, bran bread, and corn bread. Fresh fruit and vegetables counteract constipation for two reasons, namely, because they leave in the bowels a relatively large amount of undigested substance, and because they contain ingredients that have a specific purgative action. Such ingredients are especially noteworthy in rhubarb, tomatoes, apples, peaches, pears, figs, prunes, and berries. Enemas used as a routine measure are mischievous. They interfere with the "tone" of the bowel-muscle so that it acts sluggishly and bring about a condition in which the bowels will not move without artificial stimulation. At best these irrigations remove no more than the contents of the lower bowel, and should be employed only when there is acute and urgent need of clearing out the rectum. Obstinate constipation is uncommon, and strong purgatives are seldom needed. If they become necessary, a physician should be consulted as to what to take. Whenever dietary measures and exercise, which is discussed in the next chapter, fail to counteract the natural tendency toward constipation, the prospective mother may generally resort to "senna prunes" or some equally simple and harmless household remedy. Senna prunes are prepared as follows: Place an ounce of dried senna leaves in a jar and pour a quart of boiling water on them. Allow to stand two or three hours; strain off the leaves and throw them away. To the liquor add a pound of prunes. Cover and place on the back of the stove, allowing to simmer until half the liquor has boiled away. Add a pint of water and sweeten to taste, preferably with brown sugar. The prunes should be eaten with the evening meal. The number required must be learned from experience. Begin with half a dozen, and increase or decrease the number, as required. The syrup is an even stronger laxative than the prunes.