181 DROSERA ROTUNDIFOLIA. CHAP. Vltt. 



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. 30 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 437 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, Sulpliate 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 437 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 G 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- 



