Cuar. VII. PHOSPHATE OF AMMONIA. . 163 
the four corresponding ones in water; but after 24 hrs. they 
were slightly more inflected. Such evidence, however, is not at 
all trustworthy. 
Twelve leaves were immersed, each in thirty minims of a solu- 
tion of one part to 1,312,500 of water (1 gr. to 3000 oz.); so that 
each leaf received zghq5 of a grain (00135 mg.). The leaves were 
not in very good condition ; four of them were too old and of a 
dark red colour; four were too pale, yet one of these latter acted 
well; the four others, as far as could be told by the eye, seemed 
in excellent condition. The result was as follows :— 
(1) This was a pale leaf; after 40 m. about thirty-eight ten- 
tacles inflected; after 3 hrs. 830 m. the blade and many of the 
outer tentacles inflected; after 10 hrs. 15 m. all the tentacles 
but seventeen inflected, and the blade quite doubled up; after 
24 hrs. all the tentacles but ten more or less inflected. Most 
of them were closely inflected, but twenty-five were only sub- 
inflected. 
(2) After 1 hr. 40 m. twenty-five tentacles inflected; after 
6 hrs. all but twenty-one inflected; after 10 hrs. all but sixteen 
more or less inflected; after 24 hrs. re-expanded. 
(8) After 1 hr. 40 m. thirty-five inflected; after 6 hrs. “a 
large number” (to quote my own memorandum) inflected, 
but from want of time they were not counted; after 24 hrs. re- 
expanded. 
(4) After 1 hr. 40 m. about thirty inflected ; after 6 hrs. “a 
large number all round the leaf” inflected, but they were not 
counted; after 10 hrs. began to re-expand. 
(5) to (12) These were not more inflected than leaves often 
are in water, having respectively 16, 8, 10, 8, 4, 9, 14, and 0 ten- 
tacles inflected. ‘T'wo of these leaves, however, were remarkable 
from having their blades slightly inflected after 6 hrs. 
With respect to the twelve corresponding leaves in water, (1) 
had, after 1 hr. 35 m., fifty tentacles inflected, but after 11 hrs. 
only twenty-two remained so, and these formed a group, with the 
blade at this point slightly inflected. It appeared as if this leaf 
had been in some manner accidentally excited, for instance by a 
particle of animal matter which was dissolved by the water. 
(2) After 1 hr. 45 m. thirty-two tentacles inflected, but after 
5 hrs. 80 m. only twenty-five inflected, and these after 10 hrs. 
all re-expanded; (8) after 1 hr. twenty-five inflected, which 
after 10 hrs. 20 m. were all re-expanded; (4) and (5) after 
1 hr. 35 m. six and seven tentacles inflected, which re expanded 
after 1] hrs.; (6), (7) and (8) from one to three inflected, which 
