236 DROSERA ROTUNDIFOLIA. Cuapr. X. 
ten other experiments, minute bits of meat were placed 
on a single gland or on two glands in the centre of the 
disc. In order that no other glands should touch 
the meat, through the inflection of the closely adjoin- 
ing short tentacles, about half a dozen glands had 
been previously removed round the selected ones. On 
eight of these leaves from sixteen to twenty-five of the 
short surrounding tentacles were inflected in the course 
of one or two days; so that the motor impulse radiat- 
ing from one or two of the discal glands is able to 
produce this much effect. The tentacles which had 
been removed are included in the above numbers ; for, 
from standing so close, they would certainly have been 
affected. On the two remaining leaves, almost all the 
short tentacles on the disc were inflected. With a 
more powerful stimulus than meat, namely a little 
phosphate of lime moistened with saliva, I have seen 
the inflection spread still farther from a single gland 
thus treated ; but even in this case the three or four 
outer rows of tentacles were not affected. From these 
experiments it appears that the impulse from a single 
gland on the disc acts on a greater number of ten- 
tacles than that from a gland of one of the exterior 
elongated tentacles; and this probably follows, at 
least in part, from the impulse having to travel a very 
short distance down the pedicels of the central ten-- 
tacles, so that it is able to spread to a cunsiderable 
distance all round. 
Whilst examining these leaves, I was struck with the 
fact that in six, perhaps seven, of them the tentacles 
were much more inflected at the distal and proxi- 
mal ends of the leaf (i.e. towards the apex and base) 
than on either side; and yet the tentacles on the sides 
stood as near to the gland where the bit of meat Jay 
as did those at the two ends. It thus appeared as 
