16, 5 Espino: Salt Requirements of Young Rice Plants 473 
where they could be drawn as equilateral without distortion. 
The different sets of molecular salt proportions will be named 
by formulas similar to those employed by Tottingham, the letter 
S being here used in place of the C in his formulas. T1R1S1 
is the solution (or set of salt proportions) represented by the 
lower front apex of the diagram; T1R2S4 is the one represented 
by the fourth point, counting from the left, in the second row 
from the front of the lowest triangle; T3R1S2 is represented 
by the second point, counting from the left, in the front row 
of the third triangle from the bottom; T5R1S1 is represented 
by the top apex of the tetrahedron (since the fifth triangle has 
but a single point), etc. In this diagram every solution of the 
lowest triangle has one-eighth of its total molecular concentra- 
TABLE 2.—Descriptions of stock culture solutions of 4-salt types A and B 
(A, with both ammonium and nitrate; B, without nitrate).* 
{Total concentration, 0.0384 gram-molecule (of all salts taken together) per liter.] 
Molecu- Molecu- 
-lar salt | Volume lar salt | Volume 
propor- jof molec- propor- of molec-| 
tions | ularpar- tions | ularpar- 
Solution No. KH2P0s4 | tial con- Solution No. KHe2P064| tial con- 
(NHaez | centra- (NHa)2 | centra- 
SOu«Ca_ | stion of SOs«Ca | tion of 
(NOs)2 | KH2PO« (NO3)2 |KH2PO«. 
MgsS0O«4. MgSO. 
(tc 3.21.4 Ea yeaa ee 1:1:1:5 p41.) Eien eee er eee 2:1:1:4 
< ~ Se p loaeS Ble 1:1:2:4 Se B:1:2:8 
Pee o ee SY 1:1:8:8 Oe oe 2:1:8:2 
Re 1:1:4:2 Bb oS po 2:1:4:1 
PB per es 1:1:5:1 R281 pane 2:2:1:3 
ee ee oe 1:2:1:4 BS ogee eb ecse £-8-S:2 
«STR cL NE a Ca 1:2:2:3 SO ee 2:2:3:1 |) 0.0096 
La Siena oR sete ae Ae gel 1:2:3:2 |) 9 ooag ROS? 2 ee 2:8:1:2 
hh ces 1:2:4:1 2. ea eer ae Pee 7 te ee 2:9:2:2 
ica ean eee 1:3:1:3 RSL ise ta s 2:4:1:1 
Poa ee ee 1:3:2:2 TSHIS? ec $:1:1:8 
BO Se 1:3:3:1 Me eee aes $:1:2:2 
boo Lt ical aeons Reames 1:4:1:2 8 sh ee cn S:3:8:1 
liad Rea E SE 1:4:2:1 ping Hibee Wainat Gs ARAL DEe octee 8:2:1:2| 0.0144 
MRIS os a a 1:5:1:1 Re ee eae re $:2:232 
Mas) 3:8:1:1 
i SATs 5 gear mnnees se sae Seeepreae 4:1:1:2 
82 4:1:2:1] 0.0192 
Ptr fa es Pee bat Bat | 
RI oe 5:1:1:1]| 0.0240 
® The salts named are those of type A; for type B, monocalcium phosphate replaced caleium 
nitrate as here given, 
