It was shown in the last chapter that leaves which did not become
inflected by nearly a day s immersion in solutions of various salts and
acids behaved very differently from one another when subsequently
placed in the phosphate solution. I here give a table summing up the
results.
Column 1 : Name of the Salts and Acids in Solution. Column 2 : Period
of Immersion of the Leaves in Solutions of one part to 437 of water.
Column 3 : Effects produced on the Leaves by their subsequent Immersion
for stated periods in a Solution of one part of phosphate of ammonia to
8750 of water, or 1 gr. to 20 oz.
Rubidium chloride. : 22 hrs. : After 30 m. strong inflection of the
tentacles.
Potassium carbonate : 20 m. : Scarcely any inflection until 5 hrs. had
elapsed.
Calcium acetate. : 24 hrs. : After 24 hrs. very slight inflection.
Calcium nitrate. : 24 hrs. : Do. do.
Magnesium acetate. : 22 hrs. : Some slight inflection, which became
well pronounced in 24 hrs.
Magnesium nitrate. : 22 hrs. : After 4 hrs. 30 m. a fair amount of
inflection, which never increased.
Magnesium chloride : 22 hrs. : After a few minutes great inflection;
after 4 hrs. all four leaves with almost every tentacle closely
inflected.
Barium acetate. : 22 hrs. : After 24 hrs. two leaves out of four
slightly inflected.
Barium nitrate. : 22 hrs. : After 30 m. one leaf greatly, and two
others moderately, inflected; they remained thus for 24 hrs.
Strontium acetate. : 22 hrs. : After 25 m. two leaves greatly
inflected; after 8 hrs. a third leaf moderately, and the fourth very
196