EXCHANGE OF IONS 
49 
tions of one, two, or three salts which could be obtained in which 
each constituent salt had a partial concentration of 20 N X io~^ or 
some multiple of that concentration. If the composition of the 36 
solutions were represented by a triangular diagram, in the manner 
which has become familiar to plant physiologists through the work 
of Schreiner and Skinner^ the apices of the triangle would indicate 
the three unmixed constituent salts, the remaining peripheral positions 
would indicate the various mixtures of the three different pairs of 
Table I. 
Daily Concentration 
5 
6 
7 
8 
9 
10 
II 
12 
13 
14 
15 
16 
1. 108 
1.073 
1.066 
1. 03 1 
1.035 
1.026 
0.984 
0.982 
0.963 
0.966 
0.981 
1.027 
1.004 
0.989 
0.974 
0.945 
0.914 
0.889 
0.864 
0.869 
0.859 
0.879 
0.931 
1.015 
1.022 
1. 001 
0.998 
0.968 
0.960 
0.966 
0.958 
0.968 
0.978 
1.053 
1. 164 
0.994 
0.971 
0.947 
0.893 
0.824 
0.768 
0.732 
0.714 
0.694 
0.683 
0.701 
0.735 
0.861 
0-833 
0.791 
0.753 
0.706 
0.681 
0.658 
0.662 
0.665 
0.678 
0.716 
0.767 
1. 000 
0.984 
0.968 
0.936 
0.924 
0.908 
0.893 
0.915 
0.931 
0.960 
1.026 
1. 126 
1.022 
1.005 
0.950 
0.896 
0.815 
0.744 
0.703 
0.681 
0.672 
0.672 
0.710 
0.767 
^•995 
0.972 
0.866 
0.797 
n "/1 8 
o./4« 
0.730 
0.747 
0.755 
0.788 
0.840 
0.907 
1.028 
I.OI3 
0.979 
0.937 
0.890 
0.835 
0.796 
0.791 
0.792 
0.826 
0.896 
1.007 
1.008 
0.985 
0.959 
0.922 
0.897 
0.891 
0.875 
0.876 
0.893 
0.914 
0.965 
1. 041 
1,028 
1.032 
1.009 
0.975 
0.890 
0.818 
0.757 
0.715 
0.680 
0.668 
0.703 
0.780 
0.815 
0.796 
0.744 
0.707 
0.638 
0.567 
0.511 
0.478 
0.450 
0.436 
0.458 
0.521 
0.798 
G.767 
0.708 
0.661 
0.593 
0.542 
0.506 
0.492 
0.490 
0.511 
0.567 
0.641 
0.990 
0.969 
0.928 
0.885 
0.817 
0.763 
0.714 
0.672 
0.654 
0.649 
0.679 
0.735 
0.971 
0.953 
0.915 
0.871 
0.832 
0.798 
0.771 
0.769 
0.778 
0.803 
0.863 
0.952 
1. 158 
1. 139 
1. 112 
1.047 
0.937 
0.836 
0.774 
0.712 
0.661 
0.629 
0.631 
0.663 
1.056 
1.044 
0.970 
0.905 
0.796 
0.705 
0.653 
0.614 
0.591 
0.569 
0.598 
0.661 
0.873 
0.859 
0.787 
0.739 
0.656 
0.589 
0.542 
0.506 
0.467 
0.448 
0.438 
0.472 
1.050 
1. 041 
1.007 
0.954 
0.853 
0.755 
0.691 
0.657 
0.636 
0.635 
0.672 
0.739 
0.921 
0.901 
0.804 
0.745 
0.705 
0.669 
0.666 
0.675 
0.680 
0.714 
0.754 
1. 001 
0.994 
0.946 
0.904 
0.846 
0.811 
0.796 
0.805 
0.823 
0.851 
0.905 
0.973 
1.080 
1.056 
1. 010 
0.960 
0.905 
0.830 
0.779 
0.711 
0.657 
0.608 
0.612 
0.649 
0.949 
0.914 
0.841 
0.815 
0.761 
0.575 
0.529 
0.494 
0.481 
0.503 
0.559 
I.0C3 
0.977 
0.928 
0.857 
0.760 
0.683 
0.658 
0.670 
0.686 
0.726 
0.785 
0.864 
I-I93 
I-I95 
1. 148 
1. 115 
1.046 
0.962 
0.905 
0.818 
0.749 
0.694 
0.710 
0.765 
0.844 
0.816 
0.755 
0.716 
0.659 
0.590 
0.546 
0.514 
0.480 
0.458 
0.465 
0.508 
0.923 
0.907 
0.872 
0.835 
0.771 
0.770 
0.672 
0.639 
0.625 
0.629 
0.662 
0.725 
0.945 
0.935 
0.919 
0.892 
0.853 
0.820 
0.795 
0.776 
0.763 
0.760 
0.784 
0.824 
0.849 
0.812 
0.786 
0.749 
0.707 
0.639 
0.596 
0.571 
0.543 
0.546 
0.573 
0.617 
0.924 
0.921 
0.921 
0.981 
0.860 
0.812 
0.788 
0.739 
0.684 
0.633 
0.622 
0.640 
0.871 
0.854 
0.818 
0.771 
0.729 
0.685 
0.654 
0.635 
0.617 
0.591 
0.607 
0.660 
0.840 
0.810 
0.787 
0.749 
0.713 
0.667 
0.636 
0.612 
0.585 
0.584 
0.625 
0.676 
0.889 
0.870 
0.845 
0.810 
0.756 
0.702 
0.657 
0.621 
0.592 
0.575 
0.600 
0.651 
0.913 
0.877 
0.823 
0.770 
0.717 
0.665 
0.624 
0.615 
0.631 
0.652 
0.698 
0.767 
0.988 
0.974 
0.956 
0.912 
0.864 
0.799 
0.752 
0.726 
0.732 
0.741 
0.790 
0.850 
0.966 
0.941 
0.917 
0.878 
0.872 
0.863 
0.872 
0.907 
0.942 
0.988 
1.078 
1. 185 
^Schreiner, O., and Skinner, J. J., Ratio of Phosphate, Nitrate and Potassium 
on Absorption and Growth. Bot. Gaz. 50: 1-30. 19 10; Some Effects of a Harmful 
Soil Constituent. Bot. Gaz. 50: 161-181. 1910. 
