184 DROSERA ROTUNDIFOLIA. Cua. VIL 
inflected and discoloured. The leaves were then removed and 
left for two days in water; but they never re-expanded, being 
evidently dead. 
Zinc, Chloride of—Three leaves immersed in ninety minims 
of a solution of one part to 437 of water were not affected in 
25 hrs. 30 m. 
Aluminium, Chloride of—Four leaves were immersed in 120 
minims of a solution of one part to 437 of water; after 7 hrs. 
45 m. no inflection; after 24 hrs. one leaf rather closely, the 
second moderately, the third and fourth hardly at all, inflected. 
The evidence is doubtful, but I think some power in slowly 
causing inflection must be attributed to this salt. These leaves 
were then placed in the solution (1 gr. to 20 oz.) of phosphate 
of ammonia, and after 7 hrs. 80 m. the three, which had been 
but little affected by the chloride, became rather closely in- 
flected. 
Aluminium, Nitrate of—Four leaves were immersed in 120 
minims of a solution of one part to 4387 of water; after 7 hrs. 
45 m. there was only a trace of inflection; after 24 hrs. one leaf 
was moderately inflected. The evidence is here again doubtful, 
as in the case of the chloride of aluminium. The leaves were 
then transferred to the same solution, as before, of phosphate of 
ammonia; this produced hardly any effect in 7 hrs. 30 m.; but 
after 25 hrs. one leaf was pretty closely inflected, the three 
others very slightly, perhaps not more so than from water. 
Aluminium and Potassium, Sulphate of (common alum).—Half- 
minims of a solution of the usual strength were placed on the 
discs of nine leaves, but produced no effect. 
Gold, Chloride of —Seven leaves were immersed in so much of 
a solution of one part to 487 of water that each received 
30 minims, containing ~, of a grain, or 4-048 mg., of the chloride. 
There was some inflection in 8 m., which became extreme in 
45 m. In 3 hrs. the surrounding fluid was coloured purple, and 
the glands were blackened. After 6 hrs. the leaves were trans- 
ferred to water; next morning they were found discoloured and 
evidently killed. The secretion decomposes the chloride very 
readily; the glands themselves becoming coated with the 
thinnest layer of metallic gold, and particles float about on 
the surface of the surrounding fluid. 
Lead, Chloride of. — Three leaves were immersed in ninety 
minims of a solution of one part to 437 of water. After 23 hrs. 
there was not a trace of inflection ; the glands were not blackened, 
and the leaves did not appear injured. They were then trans- 
