212 DROSERA ROTUNDIFOLIA. Cuar. IX. 
three additional minutes. After 14 m. al!’ five leaves were well, 
aud some of them closely, inflected. After 6 hrs. the glands were 
white, and much mucus had been secreted. The leaves were 
now flaccid, of a peculiar dull-red colour, and evidently dead. 
One of the leaves, after an immersion of 4 m., was brushed, like the 
leaves in the camphor, but this produced no effect. A plant 
with its roots in water was exposed under a 10-oz. vessel to the 
vapour of this oil, and in 1 hr. 20 m. one leaf showed a trace of 
inflection. After 5 hrs. 20 m. the cover was taken off and the 
leaves examined; one had all its tentacles closely inflected, 
the second about half in the same state; and the third all sub- 
inflected. The plant was left in the open air for 42 hrs., but not 
a single tentacle expanded ; all the glands appeared dead, except 
here and there one, which was still secreting. It is evident 
that this oil is highly exciting and poisonous to Drosera. 
Oil of Cloves.—A mixture was made in the same manner as in 
the last case, and three leaves were immersed in it. After 30 m. 
there was only a trace of inflection which never increased. After 
1 hr. 30 m. the glands were pale, and after 6 hrs. white. No 
doubt the leaves were much injured or killed. 
Turpentine.—Small drops placed on the discs of some leaves 
killed them, as did likewise drops of creosote. A plant was left 
for 15 m. under a 12-0z. vessel, with its inner surface wetted 
with twelve drops of turpentine; but no movement of the ten- 
tacles ensued. After 24 hrs. the plant was dead. 
Glycerine.—Half-minims were placed on the discs of three 
leaves: in 2 hrs. some of the outer tentacles were irregularly 
inflected; and in 19 hrs. the leaves were flaccid and apparently 
dead ; the glands which had touched the glycerine were colour- 
less. Minute drops (about 35 of a minim) were applied to the 
glands of several tentacles, and in a few minutes these moved 
and soon reached the centre. Similar drops of a mixture 
of four dropped drops tol oz. of water. were likewise applied 
to several glands; but only a few of the tentacles moved, and 
these very slowly and slightly. Half-minims of this same mix-. 
ture placed on the discs of some leaves caused, to my surprise, no 
inflection in the course of 48 hrs. Bits of meat were then given 
them, and next day they were well inflected ; notwithstanding 
that some of the discal glands had becn rendered almost colour- 
less. Two leaves were immersed in the same mixture, but only 
for 4 hrs.; they were not inflected, and on being afterwards 
left for 2 hrs. 830 m. in a solution :1 gr. to 1 02.) of carbonate of 
ammonia, their glands were blackened, their tentacles inflected, 
and the protoplasm within their cells aggregated. 11 appears 
