150 DROSERA ROTUNDIFOLIA. (Cuar. VII. 
slight inflection, but not more than sometimes occurs with leaves in 
water. "They were then placed in the same solution of phosphate of 
ammonia; after 8 hrs. three of them were moderately inflected, as 
were all five after 24 hrs.; but not one was closely inflected. It 
appears that the nitrate of strontium renders the leaves half torpid. 
Cadmium, Chloride of—Three leaves were immersed in ninety 
minims of a solution of one part to 437 of water; after 5 hrs. 20 m. 
slight inflection occurred, which increased during the next three hours. 
After 24 hrs. all three leaves had their tentacles well inflected, and 
remained so for an additional 24 hrs.; glands not discoloured. 
Mercury, Perchloride of —Vhree leaves were immersed in ninety 
minims of a solution of one part to 437 of water; after 22 m. there 
was some slight inflection, which in 48 m. became well pronounced ; 
the giands were now blackened. After 5 hrs. 35 m. all the tentacles 
closely inflected; after 24 hrs. still 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 inflected. 
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, 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 437 of water that each received 30 minims, 
containing 5}; of a grain, or 4°048 mg., of the chloride. There was 
some inflection in 8 m., which became extreme in 45 m. In 8 hrs. the 
surrounding fluid was coloured purple, and the glands were blackened. 
After 6 hrs. the leaves were transferred to water; next morning they 
were found discoloured and evidently killed. The secretion decomposes 
the chloride very readily ; the glands themselves becoming coated with 
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