144. A leaf mosaic of Norway maple. Note the varying 

 lengths of petioles. 



145. Shoot of the common white pine, one-third natural size. 



, . 



growth 6 P Th7 h f W ? ^ f x lling , f , the leaves f rom the different years 

 feasmi's Jt+ P h >? / 6 br f nch between th tip and A is the last 

 betwe^ lf3 P : b ^ ween A an , d B ^ is two years old ; the part 

 jetween B and C is three years old; it has few leaves The nart that 

 grow four seasons ago-beyond C-has no leaves. 



