164 | DROSERA ROTUNDIFOLIA. Crap. VIL 
soon re-expanded ; (9),(10), (11) and (12) none inflected, though 
observed for twenty-four hours. 
Comparing the states of the twelve leaves in water with those 
in the solution, there could be no doubt that in the latter a larger 
number of tentacles were inflected, and these to a greater degree ; 
but the evidence was by no means so clear as in the former ex- 
periments with stronger solutions. It deserves attention that the 
inflection of four of the leaves in the solution went on increasing 
during the first 6 hrs.,and with some of them for a longer time;. 
whereas in the water the inflection of the three leaves which 
were the most affected, as well as of all the others, began to de- 
crease during this same interval. It is also remarkable that the 
blades of three of the leaves in the solution were slightly in- 
flected, and this is a most rare event with leaves in water, 
though it occurred to a slight extent in one (No. 1), which 
seemed to have been in some mariner accidentally excited. All 
this shows that the solution produced some effect, though less 
and at a much slower rate than in the previous cases. The 
small effect produced may, however, be accounted for in large 
part by the majority of the leaves having been in a poor con- 
dition. 
Of the leaves in the solution, No. 1 bore 200 glands and received 
zsboo Of a grain of the salt. Subtracting the seventeen tentacles 
which were not inflected, each gland could have absorbed only 
the g7shooo Of a grain (00000738 mg.). This amount caused 
the tentacle bearing each gland to be greatly inflected. The 
blade was also inflected. 
Lastly, eight leaves were immersed, each in thirty minims of a 
solution of one part of the phosphate to 21,875,000 of water (1 gr. 
to 5000 oz.). Each leaf thus received sq45, of @ grain of the salt, 
or 00081 mg. I took especial pains in selecting the finest leaves 
from the hot-house for immersion, both in the solution and the 
water, and almost all proved extremely sensitive. Beginning as 
before with those in the solution :— 
(1) After 2 hrs. 30 m. all the tentacles but twenty-two in- 
flected, but some only sub-inflected ; the blade much inflected; 
after 6 hrs. 80 m. all but thirteen inflected, with the blade 
immensely inflected; and remained so for 48 hrs. 
(2) No change for the first 12 hrs., but after 24 hrs. all the 
tentacles inflected, excepting those of the outermost row, of which 
only eleven were inflected. The inflection continued to increase, 
and after 48 hrs. all the tentacles except three were inflected, 
