204 Structural and Phystological Botany. } ease 
2 
contract when irritated before pollination. In this case the 
cells are probably altered in form by the contact, becom- ; 
ing shorter and broader. The stamens of Berberts,when 
rd 
Fic. 372.—Venus’s fly-trap, Dionea muscipula (natural size). . 
touched on the inner side, spring violently against the pistil, = 
and place their anthers in contact with the stigma. The 
