144 DROSEUA BOTUNDIPOLIA. [Cuap. Vlll. 



were killed. On the other hand, one of the seven, which had only 

 a few tentacles inflected, re-expanded and seemed quite healthy 

 after 48 hrs. By employing a weaker solution (viz. one part to 4H7 

 of water, or 1 gr. to 1 oz.), doses of y^jj of a grain (.(Mi75 mg.) were 

 given to six leaves. Some of these were affccteil in 37 m. ; and in 

 8 hrs. the outer tentacles of all, as Avell as the blades of two, were 

 considerably inflected. After 23 hrs. 15 ra. the tentacles had al- 

 most re-expanded, but the blades of the two were still just percep- 

 tibly cur>'ed inwards. After 48 hrs. all six leaves were fully re- 

 expanded, and appeared perfectly healthy. 



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

 tion of one part to 875 of water (1 gr. to 2 oz.), so that each re- 

 ceived ^ of a grain (2.02 mg.) ; after 40 ni. the three were much 

 affected and after 6 hrs. 45 m. the tentacles of all and the blade of 

 one closely inflected. 



Sodium, Nitrate of (pure). Half-minims of a solution of one 

 part to 437 of water, containing ^^^j of a grain (.0675 mg.), were 

 placed on the discs of five leaves. After 1 hr. 25 ra. the tentacles 

 of nearly all, and the blade of one, were somewhat inflected. The 

 inflection continued to increa.se, and in 21 hrs. 15 m. the tentacles 

 and the blades of four of them were greatly affected, and the blade 

 of the fifth to a slight extent. After an additional 24 hrs. the four 

 leaves still remained closely inflected, whilst the fifth was begin- 

 ning to expand. Four days after the solution had been applied, 

 two of the leaves had quite, and one had partially, re-expandetl; 

 whilst the remaining two remained closely inflected and appeared 

 injured. 



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

 tion of one part to 875 of water; in 1 hr. there was great inflec- 

 tion, and after 8 hrs. 15 m. every tentacle and the blades of all 

 three were most strongly inflectetl. 



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

 437 of water were placed on the discs of six leaves. After 5 hrs. 

 30 m. the tentacles of three of them (with the blade of one) were 

 considerably, and those of the other three slightly, inflected. After 

 21 hrs. the inflection had a little decreased, and in 45 hrs. the 

 leaves were fully expanded, appearing quite healthy. 



Three leaves were immerse<l, each in thirty minims of a solu- 

 tion of one part of the sulphate to 875 of water; after 1 hr. 30 m. 

 there was some inflection, which increascil so much that in 8 hrs. 

 10 m. all the tentacles and the blades of all three leaves were 

 closely inflectetl. 



Sodium, I'lioHphate of. Half-minims of a solution of one part 

 to 437 of water were placed on the discs of six leavesj. The solu- 

 tion acted with extraordinary rapidity, for in 8 m. the outer ten- 

 tacles on several of the leaves were much incur>'ed. After 6 hrs. 

 the tentacles of all leaves, and the blades of two, were closely in- 

 flected. This state of things ctmtinued for 24 hrs., excepting that 

 the blade of a third leaf became incun'ed. After 48 hrs. all the 

 leaves re-expanded. It is clear that vln of a grain of phosphate 

 of soda has great power in causing inflection. 



