better grapes in California, better oranges in Florida and better field crops in other states. Before going further into the results he has obtained, let?s see just what is involved in this matter of "mineral deficiencies", what it may mean to our health, and how it may affect the growth and development, both mental and physical, of our children. We know that rats, guinea pigs, and other animals can be fed into a diseased condition and out again by controlling only the minerals in their food. A 10-year test with rats proved that by withholding calcium they can be bred down to a third the size of those fed with an adequate amount of that mineral. Their intelligence, too, can be controlled by mineral feeding as readily as can their size, their bony structure, and their general health. Place a number of these little animals inside a maze after starving some of them in a certain mineral element. The starved ones will be unable to find their way out, whereas the others will have little or no difficulty in getting out. Their dispositions can be altered by mineral feeding. They can be made quarrelsome and belligerent; they can even be turned into cannibals and be made to devour each other. A cageful of normal rats will live in amity. Restrict their calcium, and they become irritable and draw apart from one another. Then they will begin to fight. Restore their calcium balance and they will grow more friendly; in time