190 DKOSERA EOTUNDIFOLIA. Chap. YIII. 



as that of most of the foregoing sahne 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 coloui-less. 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 

 21 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 jDro- 

 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. 



Hydrod.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 coloured 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 hi-s. they were moderately inflected ; 

 and on being transferred to water, fully re -expanded in two days, 

 and seemed quite healthy. 



Hydriodic Acid. — One to 437 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. Tliis acid acts far more powerfully 

 than hydrochloric, and is poisonous. 



Iodic Acid. — One to 437 of water ; three leaves were immersed. 



X 



