The Origin of Fruits and Cultivated Plants. "To the attractive hues of fruit, I believe, we must ultimately trace back our whole artistic pleasure in the pure physical stimulation of beautiful colors, displayed by natural objects or artificial products. Our present inquiry, then, will yield us some account of that primitive delight in red, purple, orange, and yellow, which we usually take for granted as an innate instinct of humanity, savage or civilized. When, some few months back, we analyzed the various elements of pleasure which make up our aesthetic enjoyment of a daisy, we were compelled, for the time being, to leave the original beauty of its pink-and-white rays wholly unexplained..."