162 DKOSERA ROTUNDIFOLIA. CHAP. VII. 



eight closely inflected. The leaf remained in this state for two 

 days. 



(4) After 2 hrs. 20 m. only fifty-nine tentacles inflected ; but 

 after 5 hrs. all the tentacles closely inflected excepting two 

 which were not affected, and eleven which were only sub-in- 

 flected ; after 7 hrs. blade considerably inflected ; after 12 hrs. 

 much re-expansion. 



(5) After 4 hrs. all the tentacles but fourteen inflected ; after 

 9 hrs. 30 m. beginning to re-expand. 



(6) After 1 hr. thirty- six tentacles inflected; after 5 hrs. all 

 but fifty- four inflected ; after 12 hrs. considerable re-expansion. 



(7) After 4 hrs. 30 m. only thirty-five tentacles inflected or 

 sub-inflected, and this small amount of inflection never increased. 



Now for the seven corresponding leaves in water : 



(1) After 4 hrs. thirty-eight tentacles inflected ; but after 

 7 hrs. these, with the exception of six, re-expanded. 



(2) After 4 hrs. 20 m. twenty inflected ; these after 9 hrs. 

 partially re-expanded. 



(3) After 4 hrs. five inflected, which began to re-expand after 

 7 hrs. 



(4) After 24 hrs. one inflected. 



(5), (6) and (7) Not at all affected, though observed for 

 24 hrs., excepting the short tentacles on the borders of the disc, 

 which as usual formed a ring. 



A comparison of the leaves in the solution, especially of 

 the first five or even six on the list, with those in the water, 

 after 1 hr. or after 4 hrs., and in a still more marked degree 

 after 7 hrs. or 8 hrs., could not leave the least doubt that the 

 solution had produced a great eifect. This was shown not only 

 by the vastly greater number of inflected tentacles, but by 

 the degree or closeness of their inflection, and by that of their 

 blades. Yet each gland on leaf No. 1 (which bore 255 glands, all 

 of which, excepting five, were inflected in 30 m.) could not have 

 received more than one-four-millionth of a grain ('0000162 

 mg.) of the salt. Again, each gland on leaf No. 3 (which 

 bore 233 glands, all of which, except nine, were inflected in 

 2 hrs. 30 m.) could have received at most only the 3B8 ^ 000 of 

 a grain, or '0000181 mg. 



Four leaves were immersed as before in a solution of one part 

 to 656,250 of water (1 gr. to 1500 oz.) ; but on this occasion I 

 happened to select leaves which were very little sensitive, as 

 on other occasions I chanced to select unusually sensitive 

 leaves. The leaves were not more affected after 12 hrs. than 



