14G DROSERA ROTUNDIPOLIA. [Cuap. VIII. 



mersed, each in thirty minimB of a sodium of one part to 875 of 

 >vater. After U hrs. :iU in. ulinost all the tentacles, and the blade 

 of one leaf, were closely inflected. 



ISodium, Bromide of. lialf-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 inflection; 

 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. 



Potassium, Carbonate of (pure). Half-minims of a solution of 

 one part to 437 of water were placed on six leaves. No effect was 

 produced in 24 hrs.; but after 48 hrs. some of the leaves had their 

 tentacles, and one the blade, considerably inflected. This, how- 

 ever, seemed the result of their being injured; for, on the third day 

 after the solution was given, three of the leaves were dead, and one 

 was very unhealthy; the other two were recovering, but with 

 several of their tentacles apparently injured, and these remained 

 permanently inflected. It is evident that the tj^^ of a grain of 

 this salt acts as a poison. Three leaves were also immersed, each 

 in thirty minims of a solution of one part to 875 of water, though 

 only for 9 hrs.; and, very difTerently from what occurs with the 

 salts of soda, no inflection ensued. 



Potassium, Nitrate of. Half-minims of a strong solution, of 

 one part to 109 of water (4 grs. to 1 oz.), were placed on the discs 

 of four leaves; two were much injured, but no inflection ensued. 

 Kight leaves were treated in the same manner, with drops of a 

 weaker solution, of one part to 218 of water. After 50 hrs. there 

 was no inflection, but two of the leaves seemed injured. Five of 

 these leaves were subsequentlj' teste<l with drops of milk and a 

 solution of gelatine on their discs, and only one became inflected; 

 so that the solution of the nitrate of the above strength, acting for 

 50 hrs., apparently had injured or paralysed the leaves. Six leaves 

 were then treated in the same manner with a still weaker solution, 

 of one part to 437 of water, and these, after 48 hrs., were in no 

 way aflTected, with the exception of perhaps a single leaf. Three 

 leaves were next immersed for 25 hrs., each in thirty minims of a 

 solution of one part to 875 of water, and this produced no ap- 

 parent effect. They were then put into a solution of one part of 

 carbonate of ammonia to 218 of water; the glands were immediate- 

 ly blackened, and after 1 hr. there was some inflection, and the 

 protoplasmic contents of the cells became plainly aggregated. This 

 shows that the leaves had not been much injured by their immer- 

 sion for 25 hrs. in the nitrate. 



Potassium, Sulphate of. Half-minims of a solution of one part 

 to 437 of water were placed on the discs of six leaves. After 20 

 hrs. 30 m. no effect was produced; after an additional 24 hrs. three 



