CHAP. X. CONDUCTING TISSUES. 249 



(a most powerful stimulant) near the centre of the 

 disc above the incision that is, a little towards the 

 apex with the following results : 



(1) This leaf proved rather torpid : after 4 hrs. 40 m. (in all 

 cases reckoning from the time when the meat was given) the 

 tentacles at the distal end were a little inflected, but nowhere 

 else ; they remained so for three days, and re-expanded on the 

 fourth day. The leaf was then dissected, and the trunk, as well 

 as the two sublateral branches, were found divided. 



(2) After 4 hrs. 30 in. many of the tentacles at the distal end 

 were well inflected. Next day the blade and all the tentacles at 

 this end were strongly inflected, and were separated by a dis- 

 tinct transverse line from the basal half of the leaf, which was 

 not in the least affected. On the third day, however, some of 

 the short tentacles on the disc near the base were very slightly 

 inflected. The incision was found on dissection to extend across 

 the leaf as in the last case. 



(3) After 4 hrs. 30 m. strong inflection of the tentacles at 

 the distal end, which during the next two days never extended 

 in the least to the basal end. The incision as before. 



(4) This leaf was not observed until 15 hrs. had elapsed, and 

 then all the tentacles, except the extreme marginal ones, were 

 found equally well inflected all round the leaf. On careful 

 examination the spiral vessels of the central trunk were cer- 

 tainly divided ; but the incision on one side had not passed 

 through the fibrous tissue surrounding these vessels, though it 

 had passed through the tissue on the other side.* 



The appearance presented by the leaves (2) and (3) 

 was very curious, and might be aptly compared with 

 that of a man with his backbone broken and lower ex- 

 tremities paralysed. Excepting that the line between 

 the two halves was here transverse instead of longitu- 

 dinal, these leaves were in the same state as some of 

 those in the former experiments, with bits of meat 

 placed on one side of the disc. The case of leaf (4) 



* M. Ziegler made similar ex- '"'Comptes rendus,' 1874, p. 1417), 

 {eriments by cutting the spiral but arrived at conclusions \\idclj 

 Teasels of Drosera intermedia different from mine. 



