Aue. i 5> 1921 Effect of Ammonium Sulphate upon Plants 
centrations was substituted for the potassium nitrate in the Totting- 
ham solutions of the first series. With this substitution it is reasonable 
to suppose that any marked differences in the response of the plants 
toward the nutrient media in corresponding cultures of the two series 
could be attributed to the influence of the ammonium sulphate upon the 
plants either directly or indirectly, assuming the cultures to be sub¬ 
jected alike to all other experimental conditions. Two control solutions 
serving as standards for comparison were added to each series. These 
consisted of Tottingham’s (iS) best solution for wheat, number T3R1C4, 
with a total osmotic concentration value of 2.5 atmospheres, and Shive’s 
(15) best solution for wheat, number R5C2, with an osmotic concentra¬ 
tion value of 1.75 atmospheres. 
Baker’s analyzed salts were used in the preparation of the solutions. 
Table I gives the culture numbers indicating the position of the cultures 
in the Tottingham series and the partial volume-molecular concentra¬ 
tions of the salts as they occurred in the solutions of the two series. 
The nutrient solutions of each series were made up from half-molecular 
stock solutions of the salts used to give to each solution a calculated 
total osmotic concentration value of 1 atmosphere. Freezing-point 
determinations showed that this concentration was closely approximated 
for each solution. 
Table I .—Description of solutions used 
Volume-molecular partial concentrations. 0 
T1R1C1 
C 3 
c 5 
C7 . . 
R3C1 
C3 
Cs 
R5C1 
C3 
R7C1 
T3R1C1 
C 3 
^5 
R3C1. 
c 3' 
R5C1. 
T5R1C1. 
c 3 . 
R3C1 • 
T7R1C1. 
Solution No. 
Ammonium-sulphate scries (B). 
Tottingham series (A). 
kno. 3 . 
KH 2 PC) 4 . 
Ca(N 0 3 )s. 
MgSOt. 
(NHOtSOi. 
O. 0020 
0. 00211 
0. 00146 
0. 01659 
O. 0014 
. 0020 
. 00211 
. 00438 
. 01185 
. 0014 
. 0020 
. 00211 
. 00730 
. 00711 
. 0014 
. 0020 
. 00211 
. 01022 
. 00237 
. 0014 
. 0060 
. 00211 
. OOI46 
. 01185 
. 0042 
. 0060 
. 00211 
. OO438 
. 00711 
. 0042 
. 0060 
. 00211 
. OO73O 
. 00237 
. 0042 
. OIOO 
. 00211 
. OOI46 
. 00711 
. 0070 
. OIOO 
. 00211 
. OO438 
. 00237 
. 0070 
. OI40 
. 00211 
. OOI46 
. 00237 
. 0098 
. 0020 
. O0633 
. OOI46 
. 01185 
. 0014 
. 0020 
. O0633 
. OO438 
. 00711 
. 0014 
. 0020 
. O0633 
. OO73O 
. 00237 
. 0014 
. 0060 
• 00633 
. OOI46 
. 00711 
. 0042 
. 0060 
. 00633 
. OO438 
. 00237 
. 0042 
. OIOO 
. 00633 
. OOI46 
. 00237 
. 0070 
. 002 0 
• OIO55 
. OOI46 
. 00711 
. 0014 
. 002 0 
• OIO55 
. OO438 
. 00237 
. 0014 
. 0060 
•OIO55 
. OOI46 
. 00237 
. 0042 
. 0020 
1 
. OI477 
. OOI46 
. 00237 
. 0014 
a Osnio-ic concentration value of each solution 1 atmosphere. 
