That phrase “on a holiday” covers a multitude of sins. People seem to think that they can dispense with all the precautions they would find necessary at home, and that they will escape the consequences of running needless risks because they happen to be at the seaside or in the country. The result is that many people complain that they feel tired and headachy when they are on a holiday, and that much of their pleasure is spoiled in consequence. They attribute it to the fact of the air being too strong for them, or else that it is the reaction from previous overwork. It is neither one nor the other, but is due to something quite different. [Sidenote: Diet on a holiday.] For one thing, most people eat too much when they are away, a great deal more than they would dare to take at home. Often, too, they indulge in things which they know to disagree with them in an ordinary way. The consequence is that they become dyspeptic, and their livers get out of order. That is why they have headaches and get tired so easily. If they could take less rather than more, and eschew all those things which do not suit them, the value of the holiday would be considerably enhanced. In the case of men, smoking to an excess they would never dream of at home has a similar effect in producing a feeling of lassitude. [Sidenote: Exercise.] The amount of exercise has a pronounced influence on the good of a holiday. People who have been overworked or ill, or have neglected to take regular exercise at home, should be extremely careful as to exertion when on a vacation, particularly during the first few days. A man who had saved up for a long time to have a fortnight among the mountains did so much climbing on the first day that he was knocked up for the remainder of his stay. Many others, without going to extremes such as this, feel languid all the time from the same cause. They try to make up for lost time at home by doing as much as possible in the weeks at their disposal, and think it a crime to miss any opportunity of getting about. They walk more in a day than they do in a week at home, and are surprised to find that instead of feeling braced up they are listless and tired out. Unwonted forms of exercise, too, such as many persons indulge in when away from home, are responsible for more than the spoiling of their enjoyment. For example, it is not necessary for them to bathe simply because they are at the seaside and everybody else is having a dip. Numbers of people in good health do not feel well for the rest of the day after a bathe, but in other cases the results may be more serious. Those who are run down, or broken down, or are recovering from an illness, had better avoid entering the water. Otherwise they run the risk of bringing about a recurrence of their malady.