The ash, calcium, magnesium, potassium, phosphorus, sulfur, and iron contents of wheat, oats, barley, and corn are reported. The maximum, average, and minimum contents of each mineral for the various grains grown under varying conditions are given. Variation in the mineral content of different samples of each grain is great, the variation being due to the use of irrigation water, the nature of the soil on which the grain was grown, and the variety of grain. In the case of wheat, a crude measure of the effect of each of these factors is given. The calcium, magnesium, and sulfur contents of these grains are higher than those usually reported for grains grown elsewhere. The phosphorus content is lower; consequently, the proportion of calcium to phosphorus is higher than usually reported. The question is raised whether these factors would not materially modify the nutritive value of grains grown on these highly fertile calcareous soils.