Crap. X. TRANSMISSION OF MOTOR IMPULSE. 237 
if the motor impulse was transmitted from the centre 
across the disc more readily in a longitudinal than 
in a transverse direction; and as this appeared a 
new and interesting fact in the physiology of plants, 
thirty-five fresh experiments were made to test its 
truth. Minute bits of meat were placed on a single 
gland or on a few glands, on the right or left side of 
the discs of eighteen leaves; other bits of the same 
size being placed on the distal or proximal ends of 
seventeen other leaves. Now if the motor impulse 
were transmitted with equal force or at an equal rate 
through the blade in all directions, a bit of meat 
placed at one side or at one end of the disc ought to 
affect equally all the tentacles situated at an equal 
distance from it; but this certainly is not the case. 
Before giving the general results, it may be well to 
describe three or four rather unusual cases. 
(1) A minute fragment of a fly was placed on one side of the 
disc, and after 32 m. seven of the outer tentacles near the frag- 
ment were inflected; after 10 hrs. several more became go, and 
after 23 hrs. a still greater number; and now the blade of the 
leaf on this side was bent inwards so as to stand up at right 
‘angles to the other side. Neither the blade of the leaf nor a 
single tentacle on the opposite side was affected; the line of 
separation between the two halves extending from the footstalk 
to the apex. The leaf remained in this state for three days, 
and on the fourth day began to re-expand; not a single ten- 
tacle having been inflected on the opposite side. 
(2) I will here give a case not included in the above thirty- 
five experiments. A small fly was found adhering by its feet to 
the left side of the disc. The tentacles on this side soon closed 
in and killed the fly; and owing probably to its struggle whilst 
alive, the leaf was so much excited that in about 24 hrs. all the 
tentacles on the opposite side became inflected; but as they 
found no prey, for their glands did not reach the fly, they re- 
expanded in the course of 15 hrs ; the tentacles on the left side 
remaining clasped for several days. 
(3) A bit of meat, rather larger than those commonly used, 
