LATICIFEROUS CELLS 75 



III. Separate the whole cortex from a piece of the stem ; 

 boil it in potash for about five minutes, and tease out the long 

 laticiferous cells with needles ; mount and observe with a low 

 power. They appear as long cylindrical tubes, with thick walls. 

 Observe occasional branching. They are usually broken at 

 the ends, the length of the tubes being greater than that of the 

 parts teased out. 



