132 DROSERA ROTUNDIFOLIA. [Cuap. VII. 



most of them closely; after 1 hr. blade slightly inflected; after 

 y hrs. 30 in. bcfj^an to re-e.\j)and. 



(2) After 33 m. ull the outer tentacles but twenty-five inflecteil, 

 and blade slij^htly so; after 1 hr. 30 m. blade strongly inllected 

 and remained so for 24 hrs.; but some of tlie tentacles hud tlicn 

 re-expanded. 



(3) After 1 lir. all but twelve tentacles inflected; after 2 hrs. 

 30 m. all but nine inflected; and of the inflected tentacles all ex- 

 cepting four closely; blade slightly inflected. After 8 hrs. blade 

 quite doubled up, and now all the tentacles excepting 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 allected, and eleven which were only sub-inflected; after 

 7 hrs. blade considerably inflected; after 12 hrs. much re-ex- 

 pansion. 



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

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



(G) 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- 

 inflecte<l, 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. par- 

 tially re-e.\panded. 



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



7 hrs. 



(4) After 24 hrs. one inflected. 



(5), (G) and (7) Not at all alFccted, though obseri-ed for 24 

 lirs., 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 pro- 

 duced a great effect. This was shown, not only by the vastly 

 greater number of inflected tentacles, but by the degree or close- 

 ness of their inflection, and by that of their blades. Yet each 

 gland on leaf No. 1 (wliich bore 255 glands, all of which, except- 

 ing five, were inflected in 30 m.) could not have received more than 

 one-four-millionth of a grain (.00001G2 mg.) of the salt. Again, 

 each gland on leaf No. 3 (which bore 233 glands, all of which, ex- 

 cept nine, were inflected in 2 hrs. 30 m.) could have received at 

 most only the jrrhfim ^^ * grain, or .0000181 mg. 



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

 to G.'>G.2.50 of water (1 gr. to 1500 oz.) ; but on this occasion I hap- 

 pened to select leaves which were very little sensitive, as on other 

 occasions I chanced to select unusually sensitive leaves. The 



