212 DEOSERA ROTUNDIFOLIA. CHAP. IX. 



three additional minutes. After 14 ra. al! five leaves were well, 

 and some of them closely, inflected. After 6 hrs. the glands were 

 white, and much mucus liad been secreted. The leaves were 

 now flaccid, of a peculiar dull-red colour, and evidently dead. 

 One of the leaves, after an immersion of 4 m., was brushed, like the 

 leaves in the camphor, but this produced no effect. A plant 

 with its roots in water was exposed under a 10-oz. vessel to the 

 vapour of this oil, and in 1 hr. 20 m. one leaf showed a trace of 

 inflection. After 5 hrs. 20 m. the cover was taken off and the 

 leaves examined; one had all its tentacles closely inflected, 

 the second about half in the same state ; and the third all sub- 

 inflected. The plant was left in the open air for 42 hrs., but not 

 a single tentacle expanded ; all the glands appeared dead, except 

 here and there one, which was still secreting. It is evident 

 that this oil is highly exciting and poisonous to Drosera. 



Oil of Cloves. A mixture was made in the same manner as in 

 the last case, and three leaves were immersed in it. After 30 m. 

 there was only a trace of inflection which never increased. After 

 1 hr. 30 m. the glands were pale, and after 6 hrs. white. No 

 doubt the leaves were much injured or killed. 



Tnrjmitinp. Small drops placed on the discs of some leaves 

 killed them, as did likewise drops of creosote. A plant was left 

 for 15 m. under a 12-oz. vessel, with its inner surface wetted 

 with twelve drops of turpentine ; but no movement of the ten- 

 tacles ensued. After 24 hrs. the plant was dead. 



Glycerine. Half-minims were placed on the discs of three 

 leaves : in 2 hrs. some of the outer tentacles were irregularly 

 inflected ; and in 19 hrs. the leaves were flaccid and apparently 

 dead ; the glands which had touched the glycerine were colour- 

 less. Minute drops (about -^ of a minim) were applied to the 

 glands of several tentacles, and in a few 'minutes these moved 

 and soon reached the centre. Similar drops of a mixture 

 of four dropped drops to 1 oz. of water were likewise applied 

 to several glands ; but only a few of the tentacles moved, and 

 these very slowly and slightly. Half-minims of this same mix- 

 ture placed on the discs of some leaves caused, to my surprise, no 

 inflection in the course of 48 hrs. Bits of meat were then given 

 them, and next day they were well inflected ; notwithstanding 

 that some of the discal glands had been rendered almost colour- 

 less. Two leaves were immersed in the same mixture, but only 

 for 4 hrs. ; they were not inflected, and on being afterwards 

 left for 2 hrs. 30 m. in a solution (1 gr. to 1 oz.) of carbonate of 

 ammonia, their glands were blackened, their tentacles inflected, 

 and the protoplasm within their cells aggregated. It appears 



