Social progress had been no less great than that of science. Machines driven by electricity had gradually taken the place of manual labor. At the same time the production of food had become entirely revolutionized. Chemical synthesis had succeeded in producing sugar, albumen, the amides and fats, from the air, water and vegetables, and, by skillfully varying the proportions, in forming the most advantageous combinations of carbon, hydrogen, oxygen and nitrogen, so that sumptuous repasts no longer consisted of the smoking remains of slaughtered animals—beef, veal, lamb, pork, chicken, fish and birds,—but were served amid the harmonies of music in rooms adorned with plants ever green and flowers ever in bloom, in an atmosphere laden with perfumes. Freed from the vulgar necessity of masticating meats, the mouth absorbed the principles necessary for the repair of organic tissues in exquisite drinks, fruits, cakes and pills. About the thirtieth century, especially, the nervous system began to grow more delicate, and developed in unexpected ways. Woman was still somewhat more narrow-minded than man, and her mental operations differed from his as before (her exquisite sensibility responding to sentimental considerations before reason could act in the lower cells), and her head had remained smaller, her forehead narrower; but the former was so elegantly placed upon a neck of such supple grace, and rose so nobly from the shoulders and the bust, that it compelled more than ever the admiration of man, not only as a whole, but also by the penetrating sweetness and beauty of the mouth and the light curls of its luxuriant hair. Although comparatively smaller than that of man, the head of woman had nevertheless increased in size with the exercise of the intellectual faculties; but the cerebral circonvolutions had experienced the most change, having become more numerous and more pronounced in both sexes. In short, the head had grown, the body had diminished in size. Giants were no longer to be seen. Four permanent causes had modified insensibly the human form; the development of the intellectual faculties and of the brain, the decrease in manual labor and bodily exercise, the transformation of food, and the marriage system. The first had increased the size of the cranium as compared with the rest of the body; the second had decreased the strength of the limbs; the third had diminished the size of the abdomen and made the teeth finer and smaller; the tendency of the fourth had been rather to perpetuate the classic forms of human beauty: masculine beauty, the nobility of an uplifted countenance, and the graceful outlines of womanhood. About the two hundredth century of our era, a single race existed, rather small in stature, light colored, in which anthropologists might, perhaps, have discovered some form of Anglo-Saxon and Chinese descent.