VI.] STONEWORTS. 53 



d. Anacharis. Take a yellowish-looking leaf: mount 

 in water and examine with a high power; the 

 phenomena observed are like those in Vallisneria. 

 They are best observed in the single layer of cells 

 at the margin of the leaf. 



e. Nettle-hair. Mount an uninjured hair in water 

 with the bit of leaf to which it is attached 

 (it is essential that the terminal recurved part 

 of the large cell forming the hair be not broken 

 off) ; examine with the highest available power : 

 currents carrying along very fine granules will be 

 seen in the cell, their general direction being 

 that of its long axis. 



