"Some of our lands, even in a virgin state, never were well balanced in mineral content, and unhappily for us, we have been systematically robbing the poor soils and the good soils alike of the very substance most necessary to health, growth, long life, and resistance to disease. Up to the time I began experimenting, almost nothing had been done to make good the theft. "The more I studied nutritional problems and the effects of mineral deficiencies upon disease, the more plainly I saw that here lay the most direct approach to better health, and the more important it became in my mind to find a method of restoring those missing minerals to our foods. "The subject interested me so profoundly that I retired from active medical practice and for a good many years now I have devoted myself to it." The results obtained by Dr. Northern are outstanding. By putting back into foods the stuff that foods are made of, he has proved himself to be a real miracle man of medicine, for he has opened up the shortest and most rational route to better health.  He showed that it should be done, and then that it could be done.  He doubled and redoubled the natural mineral content of fruits and vegetables.  He improved the quality of milk by increasing the iron and the iodine in it.  He caused hens to lay eggs richer in the vital elements.  By scientific soil feeding, he raised better seed potatoes in Maine,