If you desire mathematical proof that we can always continue to take definite and measurable amounts of plant food away from the limited supplies still remaining in our American soils and still have enough left to supply the needs of all future crops, let it be understood: That y = x Then xy = X3 And xy-y2 = x3-y2 Or y(x-y)=(x + y) (x-y) Hence, y = x + y Thus, y = 2y Therefore, 1=2 Now cube both sides of the last equation and: 1=8 Multiply by one hundred and sixty, the number of pounds of phosphorus still remaining in the common upland soil of Southern Maryland, and behold: 160 =1280 Thus the soil again becomes the equal of the $200 corn belt land,--Q. E. D. Fortunately, Mr. Hill, you have not found it "exceedingly difficult to work out the principles which govern the proper rotation" that "actually enriches the land." Seriously, I hope you will permit me to take this opportunity to say that I deplore, as must all right-minded and clear-thinking men, the occasional petty criticisms which attribute to you some selfish motive for the honest and noble stand you have taken concerning the importance of immediate action and of a widespread, far-reaching, and generally effective movement looking toward, not the conservation, but the restoration, and permanent preservation of American soils. According to the Scriptures, there is a sin which God, Himself, will not forgive; namely, the sin of imputing bad motives to the one who does right from motives only good and pure. Thoughts that deserve a place of honor in American history you have expressed in the following words: "The farm is the basis of all industry, but for many years this country has made the mistake of unduly assisting manufacture, commerce, and other activities that center in cities, at the expense of the farm. The result is a neglected system of agriculture and the decline of the farming interest. But all these other activities are founded upon the agricultural growth of the nation and must continue to depend upon it. Every manufacturer, every merchant, every business man, and every good citizen is deeply interested in maintaining the growth and development of our agricultural resources. Herein lies the true secret of our anxious interest in agricultural methods; because, in the long run, they mean life or death to future millions; who are no strangers or invaders, but our own children's children, and who will pass judgment upon us according to what we have made of the world in which their lot is to be cast." True and noble thoughts are these, from the master mind of a great statesman; for there are statesmen who neither grace nor disgrace the Halls of Congress. Your article contains twenty-eight pages of wholesome reading matter and instructive illustrations, and, in addition, about one page, I regret to say, of misinformation that will do much to destroy your otherwise valuable contribution to agricultural literature.