In the field of plant breeding these marvelous results are more rapid and startling because of the wider range of selection. Hybridization, the crossing of different species, has accomplished much more than simple selection. Dr. William Saunders of Canada succeeded in crossing the Ladoga and Fife varieties of wheat and secured a wheat which was earlier than Fife and yielded better than Ladoga. Likewise, Luther Burbank was able to produce a hybrid walnut by crossing the English and Black walnuts; and Webber and Swingle developed the new fruits called tangerines and citranges by crossing sweet oranges with carefully selected specimens of the wild fruit. Experiments last year in blueberry culture developed luscious berries a half inch in diameter. Possibilities in berry development are almost unlimited, especially by crossing with hardy wild varieties. Peach raisers have two great obstacles to sure success: drought in the Southwest and frost toward the North. Science is helping them to compete successfully with the severities of nature. A hardy wild peach has been found in Northern China and grafting on this stock has produced (this last year) the hardiest peach in Iowa; while another strain bids fair to meet the drought-resisting needs of the Southwest fruit grower. Our agricultural explorers are searching the world for new varieties which can be used in hybridizing to perfect the American species. For instance, a wild wheat has been found in Palestine which requires very little water. So a specialist in acclimatization was sent directly to the slopes of Mount Hermon to discover its possibilities for American dry farming. If the plant doctors succeed in developing wheat which can be raised in our arid wilderness, it would repay a thousand fold the expense of a round-the-world trip. The possible profits in skillful plant breeding are almost unlimited. Burbank is quoted as asserting: "The right man under favorable conditions can make one dollar yield a million dollars in plant breeding." In 1908 the Minnesota Experiment Station had spent $40,000 in breeding the cereal grains. The agricultural department is authority for the opinion that "the increased production is estimated at a thousand fold, or $40,000,000."[23]