To these nuances artists have given a name--values. We know the ordinary use of the word. It represents the relation of something to a certain fixed standard. Thus, we take a dollar as a standard; and say the value of this knife is fifty cents, or of that two dollars. These knives differ in value; or, on the other hand, we may have two or more knives that correspond in value. Or, again, if some of you are arranging a picnic as a Dutch treat, one of the party may undertake to bring ten cents’ worth of eggs, another ten cents’ worth of crackers, and so on. Though every one of twenty boys and girls brings something different, the value of each contribution is the same.