294 DARWINIANA. 



this fluid is always poured out around the captured 

 insect in due time, •''if the leaf is in good condition 

 and the prey suitable ; " that it comes from the leaf 

 itself, and not from the decomposing insect (for, when 

 the trap caught a plum-curculio, the fluid was ponred 

 out while he was still alive, though very weak, and 

 endeavoring, ineffectually, to eat his way out) ; that 

 bits of raw beef, although sometimes rejected after 

 a while, were generally acted upon in the same man- 

 ner — i. e., closed down upon tightly, slavered with 

 the liquid, dissolved mainly, and absorbed ; so that, in 

 fine, the fluid may well be said to be analogous to the 

 gastric juice of animals, dissolving the prey and ren- 

 dering it fit for absorption by the leaf. Many leaves 

 remain inactive or slowly die away after one meal ; 

 others reopen for a second and perhaps even a third 

 capture, and are at least capable of digesting a second 

 meal. 



Before Mr. Canby's experiments had been made, 

 we were aware that a similar series had been made in 

 England by Mr. Darwin, with the same results, and 

 with a small but highly-curious additional one — 

 namely, that the fiuid secreted in the trap of Dionasa, 

 like the gastric juice, has an acid reaction. Having 

 begun to mention unpublished results (too long al- 

 lowed to remain so), it may be well, under the circum- 

 stances, to refer to a still more remarkable experiment 

 by the same most sagacious investigator. By a prick 

 with a sharp lancet at a certain point, he lias been 

 able, to paralyze one-half of the leaf-trap, so that it 

 remained motionless under the stimulus to which the 

 other half responded. Such high and sensitive organ- 



