Cuap. IX.] VAPOUR OF ETHER. 179 
19-oz. vessel to two drops of chloroform; it was then taken out and 
examined; again exposed for 2 m. to two drops; taken out, and re- 
exposed for 3 m. to three drops; so that altogether it was exposed 
alternately to the air and during 7 m. to the vapour of seven drops of 
chloroform. Bits of meat were now placed on thirteen glands on the 
two leaves. On one of these leaves, a single tentacle first began 
moving in 40 m., and two others in 54 m. On the second leaf some 
tentacles first moved inl hr.11m. After 2 hrs. many tentacles on 
both leaves were inflected ; but none had reached the centre within 
this time. In this case there could not be the least doubt that the 
chloroform had exerted an anesthetic influence on the leaves. 
On the other hand, another plant was exposed under the same 
vessel for a much longer time, viz. 20 m., to twice as much chloroform. 
Bits of meat were then placed on the glands of many tentacles, and all 
of them, with a single exception, reached the centre in from 13 m. to 
14m. In this case, little or no anesthetic effect had been produced ; 
and how to reconcile these discordant results, I know not. 
Vapour of Sulphuric Kther—A plant was exposed for 30 m. to 
thirty minims of this ether in a vessel holding 19 oz.; and bits of 
raw meat were afterwards placed on many glands which had become 
pale-coloured; but none of the tentacles moved. After 6 hrs. 30 m. 
the leaves appeared sickly, and the discal glands were almost dry. By 
the next morning many of the tentacles were dead, as were all those 
on which meat had been placed; showing that matter had been ab- 
sorbed from the meat which had increased the evil effects of the 
vapour. After four days the plant itself died. Another plant was 
exposed in the same vessel for 15 m. to forty minims. One young, 
small, and tender leaf had all its tentacles inflected, and seemed much 
injured. Bits of raw meat were placed on several glands on two other 
and older leaves. These glands became dry after 6 hrs., and seemed 
injured; the tentacles never moved, excepting one was ultimately a 
little inflected. The glands of which the other tentacles continued to 
secrete, and appeared uninjured, but the whole plant after three days 
became very sickly. 
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-o0z. 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 10 m. 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 large dose of ether, 
and bits of meat were placed on several glands. In this case one 
tentacle on each leaf began to bend in 5 m.; and after 12 m. two 
tentacles on one leaf, and one on the second leaf, reached the centre. 
In 30 m. after the meat had been given, all the tentacles, both those 
N 2 
