220 DROSERA ROTUNDIFOLIA. Cuar. IX, 
In the two foregoing experiments the doses were evidently too 
large and poisonous. With weaker doses, the anesthetic effect 
was variable, as in the case of chloroform. A plant was exposed 
for 5 m. to ten drops under a 12-0z. vessel, and bits of meat were 
then placed on many glands. None of the tentacles thus treated 
began to move in a decided manner until 40 m. had elapsed; but 
then some of them moved very quickly, so that two reached the 
centre after an additional interval of only 10m. In 2 hrs. 12 m. 
from the time when the meat was given, all the tentacles reached 
the centre. Another plant, with two leaves, was exposed in the 
same vessel for 5 m. to a rather larger dose of ether, and bits of 
meat were placed on several glands. In this case one tentacle 
on each leaf began to bend in 5m.; and after 12 m.two tentacles 
on one leaf, and ove on the second leaf, reached the centre. In 
30 m. after the meat had been given, all the tentacles, both those 
with and without meat, were closely inflected; so that the ether 
apparently had stimulated these leaves, causing all the tentacles 
to bend. 
Vapour of Nitric Ether.—This vapour seems more injurious than 
that of sulphuric ether. A plant was exposed for 5 m. in a 12- 
oz. vessel to eight drops in a watch-glass, and I distinctly saw a 
few tentacles curling inwards before the glass was removed. 
Immediately afterwards bits of meat were placed on three 
glands, but no movement ensued in the course of 18m. The 
same plant was placed again under the same vessel for 16 m. 
with ten drops of the ether. None of the tentacles moved, 
and next morning those with the meat were still in the same 
position. After 48 hrs. one leaf seemed healthy, but the others 
were much injured. 
Another plant, having two good leaves, was exposed for 6 m. 
under a 19-oz. vessel to the vapour from ten minims of the 
ether, and bits of meat were then placed on the glands of many 
tentacles on both leaves. After 36 m. several of them on one 
leaf became inflected, and after 1 hr. almost all the tentacles, 
those with and without meat, nearly reached the centre. On 
the other leaf the glands began to dry in 1 hr. 40 m., and after 
several hours not a single tentacle was inflected; but by the 
next morning, after 21 hrs., many were inflected, though they 
seemed much injured. In this and the previous experiment, 
it is doubtful, owing to the injury which the leaves had suffered, 
whether any anesthetic effect had been produced. 
A third plant, having two good leaves, was exposed for only 
4m. in the 19-oz. vessel to the vapour from six drops. Bits of 
meat were then placed on the glands of seven tentacles on the 
