Column 1 : Number of Leaves. Column 2 : Length of Immersion in the Solution of Camphor. Column 3 : Length of Time between the Act of Brushing and the Inflection of the Tentacles. Column 4 : Length of Time between the Immersion of the Leaves in the Solution and the First Sign of the Inflection of the Tentacles. 1 : 5 m. : 3 m. considerable inflection; 4 m. all the tentacles except 3 or 4 inflected. : 8 m. 2 : 5 m. : 6 m. first sign of inflection. : 11 m. 3 : 5 m. : 6 m. 30 s. slight inflection; 7 m. 30 s. plain inflection. : 11 m. 30 s. 4 : 4 m. 30 s. : 2 m. 30 s. a trace of inflection; 3 m. plain; 4 m. strongly marked. : 7 m. 5 : 4 m. : 2 m. 30 s. a trace of inflection; 3 m. plain inflection. : 6 m. 30 s. 6 : 4 m. : 2 m. 30 s. decided inflection; 3 m. 30 s. strongly marked. : 6 m. 30 s. 7 : 4 m. : 2 m. 30 s. slight inflection; 3 m. plain; 4 m. well marked. : 6 m. 30 s. 8 : 3 m. : 2 m. trace of inflection; 3 m. considerable, 6 m. strong inflection. : 5 m. 9 : 3 m. : 2 m. trace of inflection; 3 m. considerable, 6 m. strong inflection. : 5 m. Other leaves were left in the solution without being brushed; one of these first showed a trace of inflection after 11 m.; a second after 12 m.; five were not inflected until 15 m. had [page 211] elapsed, and two not until a few minutes later. On the other hand, it will be seen in the right-hand column of the table that most of the leaves subjected to the solution, and which were brushed, became inflected in a much shorter time. The movement of the tentacles of some of these leaves was so rapid that it could be plainly seen through a very weak lens. Two or three other experiments are worth giving. A large old leaf, after being immersed for 10 m. in the solution, did not appear likely to be soon inflected; so I brushed it, and in 2 m. it began to move, and in 3 m. was completely shut. Another leaf, after an immersion of 15 m., showed no signs of inflection, so was brushed, and in 4 m. was grandly inflected. A third leaf, after an immersion of 17 m., likewise showed no signs of inflection; it was then brushed, but did not move for 1 hr.; so that here was a failure. It was again brushed, and now in 9 m. a few tentacles became inflected; the failure therefore was not complete. We may conclude that a small dose of camphor in solution is a powerful stimulant to Drosera. It not only soon excites the tentacles to bend, but apparently renders the glands sensitive to a touch, which by itself does not cause any movement. Or it may be that a slight mechanical irritation not enough to cause any inflection yet gives some tendency to movement, and thus reinforces the action of the camphor. This latter view would have appeared to me the more probable one, had it not been shown by M. Vogel that camphor is a stimulant in other ways to various plants and seeds.