556 The Philippine Journal of Science 1920 
terized by low partial concentrations of calcium nitrate and 
high partial concentrations of magnesium sulphate. 
The highest actual dry weights of tops obtained from these | 
twenty-four-day cultures was 0.761 gram, and the lowest was 
0.457 gram. The average dry yields of tops from three cultures 
each of Shive’s and Tottingham’s best solutions for wheat were 
0.684 and 0.714 gram, respectively. It, therefore, appears that 
all three of these best solutions may be expected to give about 
the same yield of tops for wheat plants of this variety grown for 
twenty-four days under the general aérial conditions met with 
in the present series. 
A few other points bearing on the top yields of this series 
will be mentioned in the discussion of series II. 
With reference to root yields, the maximum dry weight was 
obtained in culture T3R3C3. In a general way, the areas of 
high and low root yields on the diagram (fig. 3) agree with 
the corresponding areas for top yields (fig. 1). The general 
truth of this statement is especially worthy of emphasis, because 
its opposite was true for the series of Shive and of Tottingham. 
It is possible that the addition of potassium chloride to the 
Shive three-salt solution resulted in altering in a fundamental 
way the relation between top yields and root yields. 
Water absorption.—Greatest water absorption occurred with 
two cultures, T2R4C2, which also gave highest top yields, and 
culture T3R3C3, the latter culture having the following partial 
concentrations: 0.0101 M potassium chloride, 0.0103 M mono- 
potassium phosphate, 0.0072 M calcium nitrate, and 0.0038 M 
magnesium sulphate. The lowest amount of water absorption 
occurred in culture T1R1C1, which also gave the lowest top 
yield and very low root yields. This very small water absorp- 
tion appears undoubtedly related to the stunted tops and poor 
root development previously mentioned. 
Triangular diagrams for water absorption (which is prac- 
tically a measure of transpiration) have been omitted in the 
publication of this paper. But a comparison of such diagrams 
with those of figs. 1 and 3 (dry weights of tops and of roots, 
respectively) has shown that, in a very general way, the regions 
for high absorption correspond to those for high top and high 
root yields, all three occupying the areas of the triangles char- 
acterized by medium proportions of calcium and magnesium, 
and medium and low proportions of potassium chloride. This 
comparison has also shown that the areas of low water absorp- 
tion generally correspond to areas of low top and root yields, 
