24 DROSEEA EOTUNDIFOLIA. Chap. II. 



The Inflection of the Exterior Tentacles as directly caused 

 hij 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 statioi^ary 

 condition of the surrounding tentacles. (See previous 

 fig. C.) 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 45^. 

 The movement as seen through a lens resembled that 

 of the hand of a large clock. In 5 m. 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 



them, but this protluccd no effect. cause inflection. M. Ziegler 



I niiiy here add, as showing that makes still more extraordinary 



the leaves are not acted on by the statements with respect to the 



otlour of nitrogenous substances, powerof animal substances, which 



that pieces of raw meat stuck on have been left close to, but not in 

 needles were fixed as close as . contact with, sulphate of quinine. 



iw)s.sihle, without actual contact, The action of salts of quinine will 



to several leaves, but produced be described in a future chapter, 



no eflfect whatever. On the other ^ince the appearance of the paper 



hand, as we shall hereafter see, above referred to, M. Ziegler has 



the vapours of certain volatile published a book on the same 



substances and fluids, such as of subject, entitled, 'Atonicite et 



oirbonate of ammonia, chloro- Zuicite,' 1874. 

 form, certain essential oils, &c.. 



