156 DROSERA ROTUNDIFOLIA. [Cuap. VIIE 
Sulphuric Acid.—One to 487 of water; four leaves were immersed 
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 begin- 
ning 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 brs. all the tentacles closely inflected, 
and many glands colourless : surrounding fluid pink. Left in water 
for two days and a half, remained in the same state and appeared dead. 
Boracic Acid.—One to 437 cf water; four leaves were immersed. 
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 evidently dead. This acid is far more powerful than 
formic, and is highly poisonous. Half-minim drops of a stronger 
mixture (viz. one part by measure to 320 of water) were placed on the 
discs of five leaves; none of the exterior tentacles, only those on the 
borders of the disc which actually absorbed the acid, became inflected. 
Probably the dose was too strong and paralysed the leaves, for drops 
of a weaker mixture caused much inflection; nevertheless, the leaves 
all died after two days. 
Propionic Acid.—Three leaves were immersed in ninety minims of 
a mixture of one part to 437 of water; in 1 hr. 50 m. there was no 
inflection; but after 3 hrs, 40 m. one leaf was greatly inflected, and 
the other two slightly. The inflection continued to increase, so that 
iu 8 hrs. all three leaves were closely inflected. Next morning, alter 
ETIE 
