136 DROSERA ROTUNDIFOLIA. [Cuar, VII. 
Sulphate of Ammonia.—The few trials made with this and the 
following five salts of ammonia were undertaken merely to ascertain 
whether they induced inflection. Half-minims of a solution of one 
part of the sulphate of ammonia to 437 of water were placed on the 
discs of seven leaves, so that each received 54, of a grain, or *0675 
mg. After 1 hr. the tentacles of five of them, as well as the blade 
of one, were strongly inflected. The leaves were not afterwards 
observed. 
Citrate of Ammonia.—Half-minims of a solution of one part to 437 
of water were placed on the discs of six leaves. In 1 hr. the short 
outer tentacles round the discs were a little inflected, with the glands 
on the discs blackened. Aliter 3 hrs. 25 m. one leaf had its blade 
inflected, but none of the exterior tentacles. All six leaves remained 
in nearly the same state during the day, the submarginal tentacles, 
however, becoming more and more inflected. After 23 hrs. three of 
the leaves had their blades somewhat inflected, and the submarginal 
tentacles of all considerably inflected, but in none were the two, three, 
or four outer rows affected. I have rarely seen cases like this, except 
from the action of a decoction of grass, ‘the glands on the discs of the 
above leaves, instead of being almost black, as after the first hour, 
were now, after 23 hrs., very pale. I next tried on four leaves half- 
minims of a weaker solution, of one part to 1312 of water (1 grain to 3 
0z.); so that each received z850 of a grain (°0225 mg.). After 2 hrs. 
18 m. the glands on the disc were very dark-coloured; after 24 hrs. 
two of the leaves were slightly affected; the other two not at all. 
Acetate of Ammonia.—Half-minims of a solution of about one part 
to 109 of water were placed on the discs of two leaves, both of which 
were acted on in 5 hrs. 30 m., and after 23 hrs. had every single 
tentacle closely inflected. 
Oxalate of Ammonia—Half-minims of a solution of one part to 
218 of water were placed on two leaves, which, after 7 hrs., became 
moderately, and after 23 hrs. strongly, inflected. ‘lwo other leaves 
were tried with a weaker solution of one part to 437 of water; one 
was strongly inflected in 7 hrs.; the other not until 30 hrs. had 
capsed. 
Tartrate of Ammonia.—Half-minims of a solution of one part to 
437 of water were placed on the discs of five leaves. In 31 m. there 
was a trace of inflection in the exterior tentacles of some of the leaves, 
and this became more decided after 1 hr. with all the leaves; but 
the tentacles were never closely inflected. After 8 hrs. 30 m. they 
began to re-expand. Next morning, after 23 hrs., all were fully re- 
expanded, excepting one which was still slightly inflected. ‘The 
shortness of the period of inflection in this and the following case is 
remarkable. 
Chloride of Ammonia.—Hal{-minims of a solution of one part to 437 
of water were placed on the discs of six leaves. A decided degree of 
inflection in the outer and submarginal tentacles was perceptible in 25 
m.; and this increased during the next three or four hours, but never 
