Cpnar. VILL THE EFFECTS OF ACIDS. 191 
each in thirty minims; after 3 hrs. strong inflection; after 4 hrs. 
glands dark brown; after 8 hrs. 30 m. close inflection, and the 
leaves had become flaccid ; surrounding fluid not coloured pink. 
These leaves were then placed in water, and next day were 
evidently dead. 
Sulphuric Acid—One to 437 of water; four leaves were im- 
mersed, each in thirty minims; after 4 hrs. great inflection; 
after 6 hrs. surrounding fluid just tinged pink; they were then 
placed in water, and after 46 hrs. two of them were still closely 
inflected, two beginning to re-expand; many of the glands 
colourless. This acid is not so poisonous as hydriodic or iodic 
acids. 
Phosphoric Acid.—One to 437 of water; three leaves were 
immersed together in ninety minims; after 5 hrs. 30 m. some 
inflection, and some glands colourless; after 8 hrs. all the 
tentacles closely inflected, and many glands colourless ; surround- 
ing fluid pink. Left in water for two days and a half, remained 
in the same state and appeared dead. 
Boraciec Acid.—One to 437 of water; four leaves were im- 
mersed together in 120 minims; after 6 hrs. very slight inflection ; 
after 8 hrs. 15 m. two were considerably inflected, the other two 
slightly. After 24 hrs. one leaf was rather closely inflected, 
the second less closely, the third and fourth moderately. The 
leaves were washed and put into water; after 24 hrs. they 
were almost fully re-expanded and looked healthy. This acid 
agrees closely with hydrochloric acid of the same strength in 
its power of causing inflection, and in not being poisonous. 
Formic Acid.—Four leaves were immersed together in 120 
minims of one part to 437 of water; after 40 m. slight, and after 
6 hrs. 30 m. very moderate inflection; after 22 hrs. only a little 
more inflection than often occurs in water. Two of the leaves 
were then washed and placed ‘in a solution (1 gr. to 20 oz.) of 
phosphate of ammonia; after 24 hrs. they were considerably 
inflected, with the contents of their cells aggregated, showing 
that the phosphate had acted, though not to the full and 
ordinary degree. 
Acetic Acid.—Four leaves were immersed together in 120 
minims of one part to 437 of water. In 1 hr. 20 m. the tentacles 
of all four and the blades of two were greatly inflected. After 
8 hrs. the leaves had become flaccid, but still remained closely 
inflected, the surrounding fluid being coloured pink. They were 
then washed and placed in water; next morning they were still 
inflected and of a very dark red colour, but with their glands 
colourless. After another day they were dingy-coloured, and 
