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1913] HAWKINS—MALT DIASTASE 281 
In the case of the two monovalent salts, with concentrations 
in the region of m/16 (where the accelerating influence of the single 
salts is marked, without attaining its maximum), the acceleration 
of diastatic action produced by combination (molecular propor- 
tions 1:1) is notably greater than that produced by either single 
salt. At the highest concentration used (m), however, the reverse 
of this proposition holds, and the combination is not as favorable 
to diastatic action as are the single treatments. 
The four series of combinations involving sodium chloride or 
potassium chloride with the chloride of calcium or magnesium 
generally show efficiencies which follow somewhat closely those 
for the bivalent salt of the combination: With combinations of 
sodium and calcium chlorides (molecular proportions 2:1; equiva- 
lent proportions 1:1), in lower concentrations (where the calcium 
salt alone accelerates more markedly than does that of sodium) the 
efficiencies, higher than for the sodium salt alone, are not as high for 
the combination as for calcium chloride alone. In concentrations 
from 3m/64 to 3m/16 the combination results in greater accelera- 
tion than does either single treatment. 
Combinations of sodium chloride and magnesium chloride 
(molecular proportions 4:1, equivalent proportions 2:1) show no 
cases where the tendency to accelerate hydrolysis is pronouncedly 
greater than that resulting from one of the single salts. It is best 
here, for the most rapid hydrolysis, to use magnesium chloride 
In lower concentrations (where it alone accelerates more) and to 
use sodium chloride in higher concentrations (where this salt 
accelerates more). 
In concentrations of the region of m/32 the efficiencies for 
calcium chloride alone are markedly greater than for the combina- 
tion of this salt with potassium chloride (molecular proportions 
2:1; equivalent proportions 1:1), although the partial concentra- 
tions of the latter salt, when singly applied, possess a decided 
accelerating effect. At the concentration 3m/16, diastase efficiency 
for the combination used is greater than for either salt alone at 
Concentrations nearest 3m/16. 
The relations which held for combinations of potassium chloride 
and magnesium chloride (molecular proportions 4:1; equivalent 
