"A rotating crop is one that produces a sequence of different kinds of harvests," explained Mr. Powers. "By that I mean harvests of entirely varying nature. Abroad they have learned that a hoed crop, when planted annually, destroys the productivity of the earth; therefore foreigners plant beets one year in three or five and cereals, turnips, or something else in between times. Formerly they used to let the land lie fallow a year to rest it, but now they have worked out a scheme by which they get a crop every year. It was Napoleon, that Frenchman of wonderful brain, who first discovered the value of beets for making sugar, and thought out the plan for raising them in rotation with other varieties of crops. He commanded that ninety thousand acres of beets be planted in different parts of France, and he established in connection with this decree a great fund of money from which bonuses were to be paid to persons who built factories to manufacture beet-sugar. He went even further, furnishing free instruction to all who wished to learn the industry. In consequence at the end of a couple of years there were in France over three hundred small sugar factories; little by little this number has increased until now the sugar product of the French nation is enormous." Fascinated by the story Bob and Van listened attentively. "Didn't other countries steal the idea of the rotating crop?" inquired Van. "Not at first. Germany tried to make her farmers believe in the new notion, but failed," answered Mr. Powers. "Later, however, as an inducement, the German government helped beet-sugar factories pay such good prices for beets that the farmers became anxious to raise them; at the same time a high duty was placed on imported sugar, and the result was that the German people were forced to manufacture their own. At the present time about one-half of the sugar used by all the world is made in foreign factories. I myself run my beet farm on the rotation principle, and find that the hoed root crops seem to stimulate the others; but I can't convince my neighbors of it." "Does beet-sugar taste any different from cane?" inquired Bob. "Not a whit; you couldn't tell the difference," was Mr. Powers' answer. "I suppose sugar-beets are just like those in our gardens," ventured Van. "No, they're not; they are, however, not unlike them. They differ in having more juice and in usually being white," replied Mr. Powers. "The ground has first to be plowed and harrowed, and is afterward laid off in eighteen-inch rows because beets, you know, are planted from seed. When the crop comes up trouble begins, for it has to be thinned until each plant has a good area in which to grow; the beets must also be carefully weeded and the soil round them loosened if they are to thrive." "How long is it before they are ready for sugar making?" inquired Bob.