FUNCTION IN PLANT LIFE 45 



wires, and clean ends to them will save much trouble. If 

 the connecting wires are of sufficiently low resistance it 

 does not matter whether the object to be tested is one yard 

 or one hundred yards from the galvanometer. 



In order to make my meaning quite clear I have given 

 a sketch of a part of a leaf of Anihyllis Vulneraria. The 

 enclosed interspaces, or some of them, are those which 

 should be connected up, while the dark parts are those 

 which should be avoided. 



