on Plant Growth in Nutrient Solutions , &c. 369 
of the same series being represented on a single diagram and distinguished 
by differences in shading. The yields of tops are represented by dotted 
areas, and those of roots by stippled areas. 
Table V. 
, i 
Relative dry-weight yields of soy bean tops and roots from the Tottingham 
solutions of series E and F and from the modified Tottingham solu¬ 
tions of series G, supplied with suitable forms of iron and in sufficient 
amounts to prevent chlorosis. 
Series £, 
Series F, 
Series G, 
Ctilture 
number. 
source of iron FePO±. 
source of iron FeSO±. 
source of iron FePO 4 . 
Tops. 
Roots. 
Tops. 
Roots. 
Tops. 
Roots. 
ERA 
1*00 
1*00 
1*00 
1*00 
100 
100 
( o, 45 6 0 
( 3 - 5431 ) 
(0-5891) 
(5*1786) 
(0*9828) 
c 3 
i -39 
123 
1-30 
096 
0*87 
0*62 
c 5 
152 
i -33 
147 
o -99 
o -93 
0*51 
c 7 
o -73 
0-65 
1-07 
°-45 
o -59 
0*20 
R 3 Cx 
0-96 
0-98 
o-8S 
0*69 
o -59 
0*40 
c 3 
i -59 
1-32 
1*10 
o*8i 
0*70 
o-35 
C5 
o *94 
0*76 
1-22 
o-53 
0*65 
0*23 
R5C1 
o*88 
o*86 
0*87 
o*6 7 
0*50 
0*30 
C 3 
0-91 
0-71 
°'97 
0*50 
0*50 
0*18 
R 7 Cx 
0-65 
0*46 
0-65 
0*52 
o -33 
o-37 
t 3 ra 
T * r 5 
094 
0-93 
0*76 
0*67 
o *49 
C 3 
148 
i -37 
138 
1*28 
0*91 
0*52 
C 5 
o *97 
0-64 
1*21 
0*58 
o -75 
0*31 
R 3 Cx 
o -93 
o*8o 
°*99 
0*91 
0 *57 
0*42 
C 3 
o*86 
0*64 
0*98 
o -47 
o*66 
0*23 
R 5 Cx 
o-68 
0-56 
0*76 
0*58 
o *44 
0.25 
ERA 
1*09 
i-og 
0*84 
0*65 
0-52 
0*42 
C 3 
117 
°’99 
0*96 
0.51 
o*68 
0*26 
RA 
1-03 
0-92 
°*73 
0*58 
o -45 
0*29 
T-AA 
1*02 
°’95 
o*8i 
0*65 
0*47 
°-34 
Shive’s 
R 5 C 2 
1*40 
1*07 
Tottingham’s 
T 3 RA 
CC 
• 
t—< 
1*26 
Examination of the three diagrams graphically representing the high 
yields from the three series here considered shows that there is much over¬ 
lapping of the areas of top yields and root yields in each of the three series. 
In some instances, as in series E, Fig. 4 , the areas are practically super¬ 
imposed. This indicates a very close agreement between tops and roots 
with respect to the proportions of the salts required to produce high yields. 
Comparing the diagrams of Figs. 4 and 5 (series E and F) it will be 
observed that the areas representing high yields of tops and roots occupy 
the same general regions at the bases of the several triangles on each 
diagram. This is to be expected, of course, since the two series are alike in 
every respect except in the amounts and forms of iron supplied to 
the cultures; ferric phosphate being the source of iron for the plants of 
series E and ferrous sulphate for those of series F, in such amounts as were 
