A moment’s thought will satisfy you of this. Nature’s features vary with the seasons, but change little from day to day. Every morning, during the summer vacation, the same objects greet your eye, but how differently you feel towards them, according to what we call the weather, which after all is the condition of the atmosphere. One day the familiar features of the landscape will take on an expression of gladness, some other day of dullness; and the more we study the features, the more variable will their expression appear from hour to hour, day to day, and season to season.