Ouar. X, TRANSMISSION OF MOTOR IMPULSE. 239 
with No. 5 that bits of meat had to be added thrice 
before all the short tentacles on the opposite side of 
the disc were inflected. 
The result was widely different when bits of meat 
were placed in a medial line at the distal or proximal 
ends of the disc. In three of the seventeen experi- 
ments thus made, owing either to the state of the leaf 
or to the smallness of the bit of meat, only the im- 
mediately adjoining tentacles were affected; but in the 
other fourteen cases the tentacles at the opposite end 
of the leaf were inflected, though these were as distant 
from where the meat lay as were those on one side of 
the disc from the meat on the opposite side. In some 
of the present cases the tentacles on the sides were not 
at all affected, or in a less degree, or after a longer 
interval of time, than those at the opposite end. One 
set of experiments is worth giving in fuller detail. 
Cubes of meat, not quite so small as those usually em- 
ployed, were placed on:one side of the discs of four 
leaves, and cubes of the same size at the proximal 
or distal end of four other leaves. Now, when these 
two sets of leaves were compared after an interval of 
24 hrs. they presented a striking difference. Those 
having the cubes on one side were very slightly 
affected on the opposite side; whereas those with the 
cubes at either end had almost every tentacle at the 
opposite end, even the marginal ones, closely in- 
flected. After 48 hrs. the contrast in the state of the 
two sets was still great; yet those with the meat on 
one side now had their discal and submarginal ten- 
tacles on the opposite side somewhat inflected, this 
being due to the large size of the cubes. Finally we 
may conclude from these thirty-five experiments, not 
to mention the six or seven previous ones, that the 
motor impulse is transmitted from any single gland 
