134 DROSERA ROTUNDIFOLIA. (Cuar. VII. 
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 decrease during this same interval. It is also re- 
markable that the blades of three of the leaves in the solution were 
slightly inflected, 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 manner 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 condition. 
Of the leaves in the solution, No. 1 bore 200 glands and received 
astoo Of a grain of the salt. Subtracting the seventeen tentacles 
which were not inflected, each gland could have absorbed only the 
5754000 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 21,875,000 of water 1 gr. to 5000 
oz.). Each leaf thus received .545, of a 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 inflected, 
but some only sub-inflected; the blade much inflected; after 6 hrs. 
30 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 ten- 
tacles 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, and most of them 
rather closely, four or five being only sub-inflected. 
(8) No change for the first 12 hrs.; but after 24 hrs. all the 
tentacles excepting those of the outermost row were sub-inflected, 
with the blade inflected. After 36 hrs. blade strongly inflected, with 
all the tentacles, except three, inflected or sub-inflected. After 48 
hrs. in the same state. 
(4) to (8) These leaves, after 2 hrs. 30 m., had respectively 32, 17, 
T, 4, and O, tentacles inflected, most of which, after a few hours, re- 
expanded, with the exception of No. 4, which retained its thirty-two 
tentacles inflected for 48 hrs. 
Now for the eight corresponding leaves in water :— 
(1) After 2 hrs. 40 m. this had twenty of its outer tentacles 
inflected, five of which re-expanded alter 6 hrs. 30m. After 10 hrs. 
15 m. a most unusual circumstance occurred, namely, the whole 
