472 
Philippine Journal of Science 
192« 
Table 1. — Description of stock culture solutions of S-salt type I. 
[Total concentration 0.0246 gram-molecule (of all calte taken together) x*er liter.] 
Solution No. 
Molecu- 
lar salt 
propor- 
tions 
KH2PO4 
Ca(NOs)2 
MgSOi. 
Volume 
of molec- 
ular 
partial 
concen- 
tration 
of KHa 
PO4. 
Bolution No. 
Molecu- 
lar salt 
propor- 
tions 
KH2PO4 
Ca(N03)2 
MgS04. 
Volume 
of molec- 
ular 
partial 
concen- 
tration 
of KHi 
PO4. 
RlSl i 
1:1:5 
, 
R3S1 
3:1:3 
S2 ! 
1:2:4 
S2 
3:2:2 
1 0.0106 
S3 
1:3:3 
[ 0.0036 
S3 
3:3:1 
S4 
1:4:2 
R4S1 
4:1:2 
1 
S6 
1:6:1 
j 
S2 
4:2:1 
1 0.0140 
R2S1 - 
2:1:4 
R6S1 
6:1:1 
0. 0175 
2:2:3 
1 
S3 . - 
2:3:2 
1 0.0070 
S4 
2:4:1 
j 
Four-salt type A . — (Monopotassium phosphate, calcium ni- 
trate, magnesium sulphate, ammonium sulphate). Thirty -five 
different sets of molecular salt proportions were tested for this 
solution type. The thirty-five stock culture solutions all agree 
in having a total of 0.0384 gram-molecule of salt per liter and 
the molecular partial concentration of each of the four salts 
differs from solution to solution throughout the series by incre- 
ments of one-eighth of the total molecular concentration; that 
is, by increments of 0.0048 gram-molecule. These thirty-five 
different 4-salt stock solutions may be designated according to 
the positions of the points representing them on a 4-coordinate 
(solid) diagram similar to the one used by Tottingham. The 
diagram here used is shown in fig. 2. It is like that employed 
by Tottingham except that the 
several equilateral triangles on 
which the equilateral tetrahedron 
is built are here represented 
somewhat in perspective and are 
placed one above the other, the 
tetrahedron itself being indicated 
in outline and having its vertical 
axis represented as much longer 
than the other axes, in order to 
accommodate for the perspective 
Relative values of root length for Qf ^he component triangles. 
4, with 3-salt solution type I (in- 
Tottingham represented the several 
Fig. 2. 
series 4 
crements of one-seventh, total concen 
liter or 0.28 atmosphere). 
