50 



BOYS AND GIRLS IN BIOLOGY. 



these tubes unite in a bundle, and leave the stem at the 

 nodes, or knots, and they form what is called the " pe- 

 tiole," or "little foot-stalk," of the leaf (Fig. 39). 

 Again, the tubes of the foot-stalk pass off at the sides, 



Fig. 40. 



Leaflet. ... 



Little Leaf, or 

 Leaflet. 



Stipule. § Straw Leaf, or Stipule. 





 $ 2 



ZD H 

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and spread themselves out into a net-work, which 

 forms a skeleton or framework to support the leaf. 

 Each petiole, or foot-stalk, gives off from four to six of 

 those little leaves, or leaflets (Fig. 40), but at the end 



