190 DROSERA ROTUNDIFOLIA. Cuar. VIIL 
as that of most of the foregoing saline solutions. In 2 hrs. 30 m. 
some of the leaves were considerably, and in 6 hrs, 30 m. all 
were immensely, inflected, as were their blades. The surround- 
ing fluid was slightly coloured pink, which always shows that 
the leaves have been injured. They were then left in water for 
three days; but they remained inflected and were evidently 
killed. Most of the glands had become colourless. Two leaves 
were then immersed, each in thirty minims of one part to 1000 
of water; in a few hours there was some inflection; and after 
24 hrs. both leaves had almost all their tentacles and blades in- 
flected ; they were left in water for three days, and one partially 
re-expanded and recovered. Two leaves were next immersed, 
each in thirty minims of one part to 2000 of water; this pro- 
duced very little effect, except that most of the tentacles close 
to the summit of the petiole were inflected, as if the acid had 
been absorbed by the cut-off end. 
Hydroc. loric Acid.—One part to 437 of water ; four leaves were 
immersed as before, each in thirty minims. After 6 hrs. only 
one leaf was considerably inflected. After 8 hrs. 15 m. one had 
its tentacles and blade well inflected; the other three were 
moderately inflected, and the blade of one slightly. The 
surrounding fluid was not colourcd at all pink. After 25 hrs. 
three of these four leaves began to re-expand, but their glands 
were of a pink instead of a red colour; after two more days 
they fully re-expanded; but the fourth leaf remained inflected, 
and seemed much injured or killed, with its glands white. 
Four leaves were then treated, each with thirty minims of one part 
to 875 of water; after 21 hrs. they were moderately inflected ; 
and on being transferred to water, fully re-expanded in two days, 
and seemed quite healthy. 
Hydriodic Acid.—One to 487 of water; three leaves were im- 
mersed as before, each in thirty minims. After 45 m. the glands 
were discoloured, and the surrounding fluid became pinkish, but 
there was no inflection. After 5 hrs. all the tentacles were 
closely inflected; and an immense amount of mucus was secreted, 
so that the fluid could be drawn out into long ropes. The leaves 
were then placed in water, but never re-expanded, and were evi- 
dently killed. Four leaves were next immersed in one part to 875 
of water; the action was now slower, but after 22 hrs. all four 
leaves were closely inflected, and were affected in other respects 
as above described. These leaves did not re-expand, though 
left for four days in water. This acid acts far more powerfully 
than hydrochloric, and is poisonous. 
Todic Acid.—One to 437 of water; three leaves were immersed, 
