Ward’s analysis of social evolution rests on his conception of the social forces. The primary social force is desire. Desire is the expression of any of the native impulses which, at the given moment, has not been gratified. This striving for gratification constitutes desire and the moving force in the societary world. “Desire is the essential basis of all actions.” The desires are numerous and complex, but upon examination lend themselves to classification. There are two fundamental and primary sets of desires, the nutritive and the reproductive. The end of the first is to preserve the individual; and of the second, to preserve and maintain the race. “The first desire of all creatures is for nourishment.” This desire remains dominant throughout life. The human race, Ward summarizes, spent its infancy--thousands of years--in the single pursuit of subsistence.[XVII-14] When the natural food supply failed, man was forced to be inventive and to labor or die. Too many individuals in one place meant either the migration of some individuals or that others must compel nature through labor to increase her normal yield of subsistence.[XVII-15] The nutritive desire has led man to labor. Labor, however, is not the natural condition of man.[XVII-23] Work, according to Ward, is unnatural and irksome. The constant spur of hunger transformed man into a working man. To be useful, however, work must be continuous and applied steadily to a given object until that object is attained. This process is the essence of invention, the highest and most useful form of labor. Without wings, valuable weapons of offense and defense, claws for digging, man has had but one line of advance open to him, namely, invention, whereby he could overcome his limitations and master nature. Ward overlooked what Veblen has called the instinct of workmanship. Man has a desire to do, to achieve, to be active--only so can he escape the terrors of ennui. He secures illimitable enjoyment from seeing the crude materials of nature change under the manipulations of his hand and mind into works of art. Nevertheless, the need of nutrition was probably the chief factor in the invention of tools and in the storing of food against the hungry day. These tools and stores constituted property. Property at once represented power. The law of acquisition soon exerted a great force. Intense rivalries in acquiring property developed. “The grand rivalry was for the object, not the method; for the end regardless of the means.”[XVII-16] Through the centuries and until the present hour, the morality of obtaining wealth has rarely risen to the morality of many other phases of life.