222 DKOSEEA KOTUNDIFOLIA. Chap. IX. 



A plant was exposed in the same vessel to the gas for 45 m., and 

 bits of meat were then placed on four glands. Bnt the ten- 

 tacles did not move for 1 hr. 40 m. ; after 2 hrs. 30 m. all four 

 were well inflected, and after 3 hrs. reached the centre. 



The following singular phenomenon sometimes, but by no 

 means always, occurred. A plant was immersed for 2 hrs., and 

 bits of meat were then placed on several glands. In the course 

 of 13 m. all the submarginal tentacles on one leaf became con- 

 siderably inflected ; those with the meat not in the least degree 

 more than the others. On a second leaf, which was rather 

 old, the tentacles with meat, as well as a few others, were 

 moderately inflected. On a third leaf all the tentacles were 

 closely inflected, though meat had not been placed on any of 

 the glands. This movement, I presume, may be attributed to 

 excitement from the absorption of oxygen. The last-mentioned 

 leaf, to which no meat had been given, was fully re-expanded 

 after 24 hrs.; whereas the two other leaves had all their ten- 

 tacles closely inflected over the bits of meat which by this time 

 had been carried to their centres. Thus these three leaves 

 had perfectly recovered from the effects of the gas in the course 

 of 24 hrs. 



On another occasion some fine plants, after having been left 

 for 2 hrs. in the gas, were immediately given bits of meat in the 

 usual manner, and on their exposure to the air most of their 

 tentacles became in 12 m. curved into a vertical or sub-vertical 

 position, but in an extremely irregular manner ; some only on one 

 side of the leaf and some on the other. They remained in this 

 position for some, time ; the tentacles with the bits of meat not 

 having at first moved more quickly or farther inwards than the 

 others without meat. But after 2 hrs. 20 m. the former began 

 to move, and steadily went on bending until they reached the 

 centre. Next morning, after 22 hrs., all the tentacles on these 

 leaves were closely clasped over the meat which had been carried 

 to their centres ; whilst the vertical and sub- vertical tentacles on 

 the other leaves to which no meat had been given had fully 

 re-expanded. Judging, however, from the subsequent action of 

 a weak solution of carbonate of ammonia on one of these latter 

 leaves, it had not perfectly recovered its excitability and x^wer 

 of movement in 22 hrs. ; but another leaf, after an additional 

 24 hrs., had completely recovered, judging from the manner in 

 which it clasped a fly placed on its disc. 



I will give only one other experiment. After the exposure of 

 a plant for 2 hrs. to the gas, one of its leaves was immersed in 

 a rather strong solution of carbonate of ammonia, together with 



