146 DROSERA ROTUNDIFOLIA. (Cuar. VIIL 
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 in- 
flected. 
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 in- 
flection; after 22 hrs. three of the leaves had their blades and most off 
their tentacles inflected; the fourth leaf was very slightly, and the 
fifth and sixth hardly at all, affected. Three leaves were also im-- 
mersed, each in thirty minims of a solution of one part to 875 of 
water; after 40m. 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 487 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, however, seemed the- 
result of their being injured; for, on the third day after the solutiom 
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 745 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 differently 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. Hight 
leaves were treated in the same manner, with drops of a weaker solu-- 
tion, 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 
subsequently tested 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 affected, 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 apparent effect. They were then put into a solution 
of one part of carbonate of ammonia to 218 of water; the glands were 
immediately 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. 
