42 



THE LEAF 



shown in Figures 73 and 74, illustrating the two modes of 

 arrangement. Label the point at which the leaf is in- 



r 



^ 



> 



N 



71 72 73 74 



71-74. ^Arrangement of leaves: 71, opposite-leaved twig of spindie tree; 

 72, alternate-leaved twig of apple ; 73, vertical diagram of opposite-leaved t\\ ig ; 



74, vertical diagram of two-ranked twig of elm. (71, 72, after Gray.) 



serted, the node , the space between any leaf and the one 

 next above or below it, the internode ; and angle between 

 the leaf and the stem, where you 

 see the bud, the axil. How many 

 leaves are there at a node in the 

 elm and basswood .' How many in 

 the maple and honeysuckle } Are 

 the two consecutive pairs of leaves 

 in the latter placed directly over 

 each other, or at right angles ? How 



75. — Horizibntai diagram of far round from the first leaf does 



opposite leaves. ,1 j ^ i ■ ^1 1 



the second stand in the elm, grass, 

 etc. ? How does its position differ 

 from that of the same leaf in the 

 opposite mode of insertion } How 

 many leaves must be passed in order 

 to complete a turn round the stem, and 

 what leaf in numerical order stands 

 directly above the iirst .■" Draw a hori- 

 zontal diagram of both twigs repre- 



76. — Horizontal diagram 

 of two-ranked leaves, 



