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360
ride in a concentration of only 0.004 mol—0 should exercise no
nutritive action. But these results were, in the opinion of the
author of this paper, obtained from a culture with far too short
a time of growth to give decisive results. — In the second paper
(Reep and Haas, 1923, [22], p. 753, ef. 1918 [21] p. 379—380) the
results of the previous paper are said to show “an apparent an-
tagonism existing in solutions containing 230 parts per million of
total solutes. At any rate wheat plants made somewhat better
growth in ratios of CaCl, and NaCl, in which Osrernour had
found the greatest amount of antagonism, than in other ratios."
Citrus-plants, having been chosen on account of their large con-
tent of caleium, were grown in mixtures of 0.004 mol CaCl, and
NaCl-solutions and in Hoacraxp’s culture solution (1920, [11]) with
and without the substitution of calcium by polassium. Our table
IV contains dala from the table I—II of REEp’s paper (I. c. p.
Table IV after REED and Haas.
| Cilrus grandis
. | Citrus limonia
Molecular ratio
Dry-weight ICa in the ash| Dry-weight (Ca. in the ash
100 Na: 0 Ca .... 5.90 | 0.0105 8.54 * 0.0124 |
98 Na: 2Ga 25 . 6.33 0.0335 6.34 0.0161
| : i 7
| © Na:100 Ca .... 8.79 | 0.1259 7.11 0.0646
| time of growth 45 days 42 days
* Many seedlings died and were removed, the figure may thus represent a
selected superior lot of individuals and thus be too high.
754—755) recording some of the results from the cultures in
NaCl + CaCl, solutions, the data from those of HOAGLAND’s solu-
lions are not given in REED’s paper.
In the solutions 100 Na:0 Ca, the roots showed the usual stunted
appearance. In a culture in HOoAGLAND’S solution, in which the
salcium had been replaced by potassium, the same appearance of
the roots occurred, whether NaCl was present in varying quanti-
lies or was entirely absent. In some of the jars calcium was added
and the roots in these jars recovered to a certain extent. From
these facts and similar statements by other investigators REED and
Haas conclude that this stunted appearance of the roots is a conse-
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