504 
Philippme Journal of Science 
1920 
table, for the values for series 14 are both higher than the cor- 
responding ones for series 19 and one of them is higher than 
the corresponding one for series 16. It is to be remembered 
that series 14, 16, 19, and 20 were simultaneously carried out, 
as also were series 15 and 18. The highest total concentration 
(series 20) gave top length values much lower than the cor- 
responding ones of any other concentration. As to the com- 
parison between the two medium total concentrations, these two 
badly balanced sets of salt proportions agree, by both trials, in 
showing higher values for the low-medium concentration than 
for the other. Finally, there is no doubt, from the data in Table 
10, that the first three solutions belong to the high or well- 
balanced group, while the last two belong to the low or badly 
balanced group. On the whole, the indications of these data 
for top length agree very well with those derived from the dry- 
yield data for tops and roots. 
Green iveight and water content of tops . — For the four series 
carried out in the period beginning June 19, the green weights 
of tops were determined, and these are shown in Table 11. 
There were just four series (14, 16, 19, and 20) and each had 
a different total concentration, so that there are no repetitions 
to be considered in regard to green weight, but these four series 
were carried out simultaneously so that they should be com- 
parable as far as non-solution conditions are concerned. In 
Table 11 the letters H and L are fixed to the values belonging 
to the high and low groups, respectively, as in the cases of dry 
yields (Tables 5 and 9). 
Considering the comparative physiological values of the four 
different total concentrations, as shown in Table 11, it is seen 
that for the lowest total concentration all but one (T4) of the 
five triangles of the tetrahedral diagram have one or more high 
green-weight values, and that all but one (T5) have one or more 
low values also. On the other hand, for the highest total con- 
centration the lowest triangle of the diagram has seven values of 
the high group and none of the low group, the second triangle has 
one high value and two low values, and the remaining three 
triangles have one or more low values each, but no high value. As 
in the case of the dry yields of tops, the higher the total concen- 
tration the more segregated the high values in the lower part of 
the diagram and the low values in the upper part. As the total 
concentration is progressivelj^ higher the ability of the plants 
to withstand the higher partial concentration of monopotassium 
phosphate becomes markedly diminished. For the highest total 
