Manner of performing the experiments—Action of distilled water
in comparison with the solutions—Carbonate of ammonia, absorbed
by the roots—The vapour absorbed by the glands- -Drops on the
disc—Minute drops applied to separate glands—Leaves immersed in
weak solutions—Minuteness of the doses which induce aggregation
of the protoplasm—Nitrate of ammonia, analogous experiments
with—Phosphate of ammonia, analogous experiments with- -Other
salts of ammonia—Summary and concluding remarks on the action of
salts of ammonia. The chief object in this chapter is to show
how powerfully the salts of ammonia act on the leaves of
Drosera, and more especially to show what an extraordinarily
small quantity suffices to excite inflection. I shall,
therefore, be compelled to enter into full details. Doubly
distilled water was always used; and for the more delicate
experiments, water which had been prepared with the utmost
possible care was given me by Professor Frankland. The graduated
measures were tested, and found as accurate