A GREEN LEAF 



65 



mass of small-celled tissue or " meristem," as 

 botanists term it, the cells of which are continu- 



Fig. 43. The growing point ot a stem, where new 

 leaves are being formed 



ally dividing' and subdividing to form new tissue, 

 forming lateral protrusions in regular succession. 

 Each protrusion is the basis of a leaf, and as these 



