leaves are not acted on by the odour of nitrogenous substances, that
pieces of raw meat stuck on needles were fixed as close as possible,
without actual contact, to several leaves, but produced no effect
whatever. On the other hand, as we shall hereafter see, the vapours of
certain volatile substances and fluids, such as of carbonate of
ammonia, chloroform, certain essential oils, &c., cause inflection. M.
Ziegler makes still more extraordinary statements with respect to the
power of animal substances, which have been left close to, but not in
contact with, sulphate of quinine. The action of salts of quinine will
be described in a future chapter. Since the appearance of the paper
above referred to, M. Ziegler has published a book on the same subject,
entitled 'Atonicit et Zoicit,' 1874.) [page 24]

The Inflection of the Exterior Tentacles as directly caused by Objects
left in Contact with their Glands.

I made a vast number of trials by placing, by means of a fine needle
moistened with distilled water, and with the aid of a lens, particles
of various substances on the viscid secretion surrounding the glands of
the outer tentacles. I experimented on both the oval and long-headed
glands. When a particle is thus placed on a single gland, the movement
of the tentacle is particularly well seen in contrast with the
stationary condition of the surrounding tentacles. (See previous fig.
6.) In four cases small particles of raw meat caused the tentacles to
be greatly inflected in between 5 and 6 m. Another tentacle similarly
treated, and observed with special care, distinctly, though slightly,
changed its position in 10 s. (seconds); and this is the quickest
movement seen by me. In 2 m. 30 s. it had moved through an angle of
about 45o. The movement as seen through a lens resembled that of the
hand of a large clock. In 5 m. it had moved through 90o, and when I