21 DROSEKA EOTUNDIFOLIA. CHAP. IL 



The Inflection of ilie Exterior Tentacles as directlij caused 

 ty 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 rne. In 2 m. 

 30 s. it had moved through an angle of about 45. 



o ~ 



The movement as seen through a lens resembled that 

 of the hand of a large clock. In 5 rn. 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 produced no effect. cause inflection. M. Ziegler 



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



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



.Ddour of nitrogenous substances, power of animal substances, which 



that pieces of raw meat stuc'k on have been left close to, but not in 



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



possible, without actual contact, The action of salts of quinine will 



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



no effect whatever. On the other Since the appearance of the paper 



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



the vapours of certain volatile published a book on the same 



substances and fluius, such as of subject, entitled, ' Atouieite ot 



carbouate of ammonia, chloro- Zoicite,' 187-i. 

 form, certain essential oib, &c., 



