472 Philippine Journal of Science 1920 
TABLE 1.—Description of stock culture solutions of 3-salt type I. 
[Total concentration 0.0245 gram-molecule (of all salts taken together) per liter.] 
Volume Volume 
Molecu- Molecu- 
of molec- of molec-} 
Tas aalt | Sine lav aalt "cae 
Solution No. tions | Partial Solution No. tions | Partial 
; KH2 PO«| concen- : K He POs | concen- 
Ca(NOs)2| tration Ca(NOs)2| tration 
MgSO. | 0fKH2 MeSO,, | of KHs 
4 | PO. RO | POL 
te A ee eat make ne ae a a ee $:1:3 | 
Be 1:2:4 ee eo 3:2:2 |; 0.0105 
«Sei inp Rccenecatee S eseain 1:3:3 |> 0.0085 Be es ee 3:3:111 
V2 Baa Ee Saeee SON gs Se ae aE 1:4:2 i eee 232 ft o.omo 
eae er Dae 8 eg One 12671 Wachee os es cea 4:23:31 
R281 i 2:1:4 yd) gre aie eMC Sh 5:1:1] 0.017 
+ aS RS LAER 2:2:8 
Boos 2:3:2 | ee 
Poe Ses 2:4:1 
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-coérdinate 
(solid) diagram similar to the one used by Tottingham. The 
diagram here used is shown in fig. 2. It is like that employed 
1.00 by Tottingham except that the 
several equilateral triangles 
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 
m= >, than the other axes, in order to 
30 
ive 
ie a _ POs accommodate for the spe 
Gc. 2. tive values of root length f. . ia : 
series 4, with 3-salt solution type I on. Wiews of the component oe ve 
erements of one-seventh, total concen- Tottingham represented the se 
tration of 0.0061 gram-molecul * Jane; 
liter or 0.23 atmosphere), ss triangles all on the same P 
