178 DROSERA ROTUNDIFOLIA. CHAP. VIII. 



of four leaves. Two, apparently, were not at all affected in 

 18 hrs. ; the third had its tentacles slightly inflected ; whilst 

 the fourth had almost all its tentacles inflected in 24 hrs., and 

 these did not begin to re-expand until the fourth day, and were 

 not perfectly expanded on the seventh day. I presume that 

 this leaf was injured by the salt. Half-minims of a weaker 

 solution, of one part to 437 of water, were then dropped on the 

 discs of six leaves, so that each received -^ of a grain. In 

 1 hr. 33 m. there was slight inflection ; and after 5 hrs. 30 m. 

 the tentacles of all six leaves were considerably, but not closely, 

 inflected. After 23 hrs. 15 m. all had completely re-expanded, 

 and did not appear in the least injured. 



Three leaves were immersed, each in thirty minims of a solu- 

 tion of one part to 875 of water, so that each received -^ of a 

 grain, or 2 '02 mg. After 1 hr. there was much inflection; 

 after 8 hrs. 30 m. all the tentacles and the blades of all three 

 were closely inflected. Four other leaves were also immersed 

 in the solution, each receiving the same amount of salt 

 as before, viz. -^ of a grain. They all soon became inflected ; 

 after 48 hrs. they began to re-expand, and appeared quite un- 

 injured, though the solution was sufficiently strong to taste 

 saline. 



Sodium, Iodide of. Half-minims of a solution of one part to 

 437 of water were placed on the discs of six leaves. After 

 24 hrs. four of them had their blades and many tentacles in- 

 flected. The other two had only their submarginal tentacles 

 inflected ; the outer ones in most of the leaves being but little 

 affected. After 46 hrs. the leaves had nearly re-expanded. 

 Three leaves were also immersed, each in thirty minims of a 

 solution of one part to 875 of water. After 6 hrs. 30 m. almost 

 all the tentacles, and the blade of one leaf, were closely inflected. 



Sodium, Bromide of. Half-minims of a solution of one part to 

 437 of water were placed on six leaves. After 7 hrs. there was 

 some inflection ; after 22 hrs. three of the leaves had their blades 

 and most of their tentacles inflected ; the fourth leaf was very 

 slightly, and the fifth and sixth hardly at all, affected. Three 

 leaves were also immersed, each in thirty minims of a solution 

 of one part to 875 of water; after 40 m. there was some inflec- 

 tion ; after 4 hrs. the tentacles of all three leaves and the blades 

 of two were inflected. These leaves were then placed in water, 

 and after 17 hrs. 30 m. two of them were almost completely, 

 and the third partially, re-expanded ; so that apparently they 

 were not injured. 



