STIMULATION AND ITS EESULTS 



389 



in the protoplasm of the cells on the lower sides of its 

 pulvini, in consequence of which water escapes from them 



FIG. 158. SECTION OF STEM OP DICOTYLEDONOUS PLANT ATTACKED BY 

 HAUSTOBIA OP Cuscuta. 



into the intercellular spaces between them. It is attended 

 by a change of colour, the pulvinus becoming of a deeper 



