. 
160 DROSERA ROTUNDIFOLIA. Cuar. VIL. 
40 m. all the outer tentacles except twenty-five were inflected, 
as was the blade in a strongly marked manner. After 24 hrs, 
every tentacle except one was closely inflected, and the blade 
was completely doubled over. Thus the leaf remained for two 
days, when it began to re-expand. 1 may add that the three 
latter leaves (Nos. 9, 10, and 11) were still somewhat inflected 
after three days. The tentacles in but few of these eleven leaves 
became closely inflected within so short a time as in the pre- 
vious experiments with stronger solutions. 
We will now turn to the twenty corresponding leaves in water. 
Nine had none of their outer tentacles inflected; nine others 
had from one to three inflected; and these re-expanded after 
8hrs. The remaining two leaves were moderately affected; one 
having six tentacles inflected in 84 m.; the other twenty-three 
inflected in 2 hrs. 12 m.; and both thus remained for 24 hrs. 
None of these leaves had their blades inflected. So that the con- 
trast between the twenty leaves in water and the twenty in the 
solution was very great, both within the first hour and after 
from 8 to 12 hrs. had elapsed. 
Of the leaves in the solution, the glands on leaf No. 1, which 
in 2 hrs. had all its tenticles except eight inflected, were 
counted and found to be 202. Subtracting the eight, each gland 
could have received only the zss4qq5 Of a grain (0000411 mg.) 
of the phosphate. Leaf No. 9 had 213 tentacles, all of which, 
with the exception of four, were inflected after 24 hrs., but 
none of them closely; the blade was also inflected; each gland 
could have received only the zg7k5oq Of a grain, or ‘0000337 
mg. Lastly, leaf No. 11, which had after 24 hrs, all its ten- 
tacles, except one, closely inflected, as well as the blade, bore 
the unusually large number of 252 tentacles; and on the same 
principle as before, each gland could have absorbed only the 
zootoon Of a grain, or 0000322 mg. 
With respect to the following experiments, I must premise 
that the leaves, both those placed in the solutions and in water, 
were taken from plants which had been kept in a very warm 
greenhouse during the winter. They were thus rendered ex~- 
tremely sensitive, as was shown by water exciting them much 
more than in the previous experiments. Before giving my 
observations, it may be well to remind the reader that, judging 
from thirty-one fine leaves, the average number of tentacles is 
192, and that the outer or exterior ones, the movements of 
which are alone significant, are to the short ones on the dise in 
the proportion of about sixteen to nine, 
