304 Pellagra-Producing Diets. IV 
about 75, wheat, maize, and rice proteins 50, flaxseed proteins 40, 
and the proteins of the pea and navy bean about 25. Since the 
vegetable proteins from various sources exhibit such great varia- 
tions in their content of the several amino-acids which can be 
ap proximately quantitatively estimated, it is reasonable to expect 
that mixtures of seeds from various sources should in many 
cases show greatly enhanced values with respect to the biological 
value of the protein mixture over that of the seeds fed singly as 
the sole source of protein. 
Mixtures of certain seeds should, therefore, on theoretical 
erounds, be adequate as a source of protein, and the dietary in- 
adequacy of such mixtures should be limited, in the light of our 
past experience, to a relative shortage of the fat-soluble A and 
as to the character and amount of the inorganic content. The 
following table,- which was compiled from data by Forbes (2), 
shows for the seeds, which are of greatest importance as foods in 
the United States, the great similarity in their content of all in- 
organic elements except magnesium and calcium. The table 
also contains data relating to the inorganic content of corn meal 
and bolted flour. 7 
Mineral Constituents of Seeds. Parts per 100 of Dry Substance. 
Ash. K Na Ca Meg P S) Cl 
Wihéatieileint. Soe 2.08 |0.504'0.026/0.041)0.141/0.408/0.009|0.058 
Rice; hubleilis iirc. oo gare: 0.39 |0.070)0.016/0 .009|0 .026|0 .091/0.001)/0 .0004 
Oats, rolled 20) cee 1.83 |0.036)0.058)/0 .097/0 .086/0 .385/0.005/0 .098 
COT: 3. te ee 1.55 |0.320)0.052/0.011/0.125/0.336/0.160/0.045 
Soy beanssciac.aace AER L’ 4° 3.14 |1.162/0.023/0.119|0.169/0.503)/0.034 
White beans. 2s. 3) 2 3.22 |1.177/0.036)0 .154/0.148/0 .500/0 .052 
Cottonseed meal........... 7.48 |1.847 0.236/0.686)1.500)0 .037 
Lanseed: méalvcc tes; cakes 5.84 |1.179|0.063/0.351/0.558/0.806/0.076 
Bean rick nk other ae aie 0.940)0.072/0 .139]0.150|0.370/0 .264)/0 .034 
Barley i cote eee 1.99 |0.270)0.061/0.011)0.150)0 .285/0 .024 
PStene fOUP? tie esa eee 0.51 |0.145/0.003/0.025,0.025/0.111 
Gormemeaglin ye IS 0.68 |0.163)0.018)/0.031/0.061/0.134 
Milk (cow) Nb 4 et ow i9 5.67 |1.160|0.344/0.909|0.088 0.650/0.057\0.791 
SS Uhh in aie selec eos mee oak 2.42 |0.679|0.165 pe280 0:02) 0.240|0.018'0.445 
