Cnarv. IL]  INFLECTION INDIRECTLY CAUSED. 23 
The movement as seen through a lens resembled that of the 
hand of a large clock. In 5m. it had moved through 90°, 
and when I looked again after 10 m., the particle had reached 
the centre of the leaf; so that the whole movement was 
completed in less than 17 m. 30s. In the course of some 
hours this minute bit of meat, from having been brought into 
contact with some of the glands of the central disc, acted 
centrifugally on the outer tentacles, which all became closely 
inflected. Fragments of flies were placed on the glands of 
four of the outer tentacles, extended in the same plane with 
that of the blade, and three of these fragments were carried 
in 85 m. through an angle of 180° to the centre. The 
fragment on the fourth tentacle was very minute, and it 
was not carried to the centre until 3 hrs. had elapsed. In 
three other cases minute flies or portions of larger ones 
were carried to the centre in 1 hr. 30 s. In these seven 
cases, the fragments or small flies, which had been carried 
by a single tentacle to the central glands, were well em- 
braced by the other tentacles after an interval of from 4 to 
10 hrs. ; 
Talso placed in the manner just described six small balls 
of writing paper (rolled up by the aid of pincers, so that 
they were not touched by my fingers) on the glands of six 
exterior tentacles on distinct leaves; three of these were 
carried to the centre in about 1 hr., and the other three in 
rather more than 4 hrs.; but after 24 hrs. only two of the 
six balls were well embraced by the other tentacles. It is 
possible that the secretion may have dissolved a trace of 
glue or animalised matter from the balls of paper. Four 
particles of coal-cinder were then placed on the glands of 
tour exterior tentacles; one of these reached the centre in 
3 hrs. 40 m.; the second in 9 hrs.; the third within 24 hrs., 
but had moved only part of the way in 9 hrs.; whilst the 
fourth moved only a very short distance in 24 hrs., and 
never moved any farther. Of the above three bits of cinder 
which were ultimately carried to the centre, one alone was 
well embraced by many of the other tentacles. We here see 
clearly that such bodies as particles of cinder or little balls 
of paper, after being carried by the tentacles to the central 
glands, act very differently from fragments of flies, in 
causing the movement of the surrounding tentacles. 
I made, without carefully recording the times of move- 
ment, many similar trials with other substances, such as 
