Salt mixtures __________________________________________________________________________ | | NUMBER OF MIXTURES |______________________________________________ | | | | | | INGREDIENTS | 185 | 314 | 318 | 500 | 211 | ? ___________________________|_______|_______|_______|_______|_______|______ | | | | | | | grams | grams | grams | grams | grams | grams | | | | | | NaCl . . . . . . . . . . . | 0.173 | 1.067 | 1.400 | 0.5148| 0.520 | 15.00 MgSO_4 anhydrous . . . . . | 0.266 | | | | | 1.90 Na_2HPO_4:H_2O . . . . . . | 0.347 | | | | | K_2HPO_4 . . . . . . . . . | 0.954 | 3.016 | 2.531 | 0.3113| | 34.22 CaH_4(PO_4)_2:H2O . . . . | 0.540 | | | | 0.276 | 0.89 Ca lactate . . . . . . . . | 1.300 | 5.553 | 7.058 | 2.8780| 1.971 | 57.02 Ferrous lactate . . . . . | 0.118 | | | | | K citrate:H_2O . . . . . . | | 0.203 | 0.710 | 0.5562| 0.799 | Na citrate anhydrous . . . | | | | | | 3.70 Ferric citrate . . . . . . | | 0.100 | | | | 2.00 Mg citrate . . . . . . . . | | | | | | 7.00 CaCl_2 . . . . . . . . . . | | 0.386 | | 0.2569| | CaSO_4:2H_2O . . . . . . . | | 0.381 | 0.578 | | | Fe acetate . . . . . . . . | | | | | 0.100 | ___________________________|_______|_______|_______|_______|_______|______ These diets fall as shown, into two classes. The first group correspond to those of Osborne and Mendel and are available for general testing of any unknown. The cereal combinations are so constituted that all deficiencies of salts are covered and the proportions of the cereal are so selected as to provide the right proportions of protein, fat and carbohydrate. By adding enough butter fat to supply the "A" the deficiency in the "B" can be tested and by adjusting the amounts of "B" on the dextrin the cereal deficiency in this vitamine can be obtained. It is obvious that by substituting lard for the butter fat one could use the same mixture properly supplemented with the "B" to determine the "A" deficiencies of the wheat. The most prominent worker in the field of the "A" vitamine measurement in America is Steenbock. His basal diets are a combination of those already described.