In a community which is visited by gastric fever as an epidemic this fact is striking--only a portion of the people are affected by the visitation. Here is one man who drinks the water which gives gastric fever to another; that water goes into his stomach as it does into that of his neighbour, and passes through his system the same, yet death is the result in one case, and not even sickness or inconvenience in the other. In the latter case the system has the power of resistance, and our aim should be to increase this. Therefore we say by all means look to the healthful state of the lungs and bowels when you have the least reason to fear that bad water may bring gastric fever to you or yours. If there is any tendency to constipation get some liquorice, and boil it thoroughly with about half an ounce of senna leaves to a twopenny stick. Strain well, and let all in any danger have a teaspoonful of this thrice a day. It will do wonders in keeping matters in a good state within. If possible, give a good rubbing all over once a week with hot vinegar, and follow that up with warm olive oil. That will do a great deal to keep things right outside. Take and give more rest than usual to the toil-worn when such danger is near, and have as good food provided for all as is possible. There may be danger in the air, and still worse danger in the water to those whose vital force has got low, while there is none in either to those whose systems are in good tune. You are, perhaps, ready to ask if we care nothing about bad water? Certainly; we care a great deal about it, as we do about bad air. By all means condemn wells and streams that are corrupted, and insist on the opening of better ones. Make it a first condition of having anything to do with a place for habitation that it has good air and good water. We are only pointing out the best safeguard when neither the one nor the other can be insured. In all cases where water is suspected, it should be boiled before use. There is, in great numbers of persons, both old and young, what may be called the natural aptitude of healing. They are kept back from trying to help because it is regarded as so dangerous a thing to go near fever, and also to interfere where only professional skill is legally allowed. To apply such a remedy as that which we have here sketched for gastric fever is perfectly safe in both senses. No medical man worthy of being regarded will find any fault with it, and there is no danger to either the patient or the person applying it. The mode we have pointed out involves nothing that may not be easily had by the very poorest. What is wanted is only one or two who shall be Christian enough to care just a little for human bodies as well as human souls, and who shall study such simple and accessible remedies, and be ready to guide their fellow-creatures in a time of trouble. Fever, Hay.--_See_ Hay Fever.