194 DROSERA ROTUNDIFOLIA. Cuar. VILL 
there was no inflection; after 7 hrs. 30 m. two of the leaves 
showed some inflection, and the glands were almost white; 
after 21 hrs. two of the leaves were considerably inflected, 
and a third slightly; most of the glands were white, the others 
dark red. After 45 hrs. one leaf had almost every tentacle in- 
flected ; a second a large number ; the third and fourth very few; 
almost all the glands were white, excepting those on the discs of 
two of the leaves, and many of these were very dark red. The 
leaves appeared dead. Hence lactic acid acts in a very peculiar 
manner, causing inflection at an extraordinarily slow rate, and 
being highly poisonous. Immersion in even weaker solutions, 
viz. of one part to 1812 and 1750 of water, apparently killed the 
leaves (the tentacles after a time being bowed backwards), and 
rendered the glands white, but caused no inflection. 
Gallic, Tannic, Turtaric, and Citrie Acids.—One part to 487 of 
water. Three or four leaves were immersed, each in thirty 
minims of these four solutions, so that each leaf received j, of a 
grain, or 4048 mg. No inflection was caused in 24 hrs., and the 
leaves did not appear at all injured. Those which had been in 
the tannic and tartaric acids were placed in a solution (1 gr. to 
20 oz.) of phosphate of ammonia, but no inflection ensued in 
24 hrs. On the other hand, the four leaves which had been in 
the citric acid, when treated with the phosphate, became decidedly 
inflected in 50 m. and strongly inflected after 5 hrs., and so 
remained for the next 24 hrs. 
Malic Acid.—Three leaves were immersed in ninety minimé of 
a solution of one part to 487 of water; no inflection was caused 
in 8 hrs, 20 m., but after 24 hrs. two of them were considerably, 
and the third slightly, inflected—more so than could be ac- 
counted for by the action of water. No great amount of mucus 
was secreted. They were then placed in water, and after two 
days partially re-expanded. Hence this acid is not poisonous. 
Oxalic Acid.—Three leaves were immersed in ninety minims of 
a solution of 1 gr. to 437 of water; after 2 hrs. 10 m. there was 
much inflection; glands pale; the surrounding fluid of a dark 
pink colour; after 8 hrs. excessive inflection. The leaves were 
then placed in water; after about 16 brs. the tentacles were of 
a very dark red colour, like those of the leaves in acetic acid. 
After 24 additional hours, the three leaves were dead and their 
glands colourless. 
Benzoic Acid,—Five leaves were immersed, each in thirty 
minims of a sclution of 1 gr. to 437 of water. ‘This solution was 
so weak that it only just tasted acid, yet, as we shall see, was 
highly poisonous to Drosera. After 52 m. the submarginal 
