LEAF ARRANGEMENT. 99 



of the stem when it reaches the third leaf. 

 The angular distance between the first leaf 

 and the second is just one haK the circum- 

 ference of the stem, and it is the same be- 

 tween the second and the third. We will 



Fig. 76. 



therefore express this distance by the frac- 

 tion ^. We can use this fraction to repre- 

 sent more than the angular divergence : the 

 denominator 2 represents the number of 

 leaves above the first touched by one revolu- 



