THE SPERM APHYTES. 



255 



like tentacles. These are not true hairs. Each is pene- 

 trated by a branch from the fibrovascular system of the 

 leaf. At the tip of each is a minute gland which secretes a 



186 187 



FIG. 186. Leaf of Drosera rotundifolia with its tentacles expanded. (After 



Darwin.) 

 FIG. 187. Drosera rotundifolia with the tentacles of the left side contracted 



and inclosing a bit of meat. (After Darwin.) 



thick, sticky liquid. 

 Touch these tenta- 

 cles with bits of 

 meat or with in- 

 sects. What is the 

 result? Repeat, 

 using inorganic sub- 

 stances. Is the re- 

 sult the same as 

 before? Place bits 

 of meat on the inner 

 part of the leaf, but 

 not touching the ten- 



FIG. 188. 1, the head of one of the tentacles 



tacles. Keep Under O f Drosera rotundifolia, with a drop of the 



observation for ten viscid secretion surrounding it; 2, a section 



through the head, showing the structure. 

 Or fifteen minutes. Highly magnified. (After Darwin.) 



