THE FOOD OF THE PLANT 



27 



Take a young plant growing in a pot, e.g. a sycamore. 

 (A single leaf cut from a healthily growing plant will 

 serve, but it is better to use one that is actually attached 

 to the plant.) Cut two small pieces of blotting-paper 



KlG. 11 



or filter-paper, about three-quarters of an inch square. 

 Dip them into cobalt chloride solution and then dry. 

 Tate two small pieces of glass ; microscope slides answer 

 well for this purpose. Place the two pieces of paper 

 over the upper and under surfaces of a leaf; cover them 



