50 BUDS AND STIPULES 



than the leaf. By the time, however, that the leaf-blade 

 has reached -g-^th inch (fig. 67) the stipules have caught 

 it up. They are more oval, more pointed, and bordered 

 by a row of small projections. They continue to grow 

 (fig. 68) more rapidly than the leaf-blade, and some- 

 what unequally (fig. 69), the larger one becoming 

 rather more (fig. 70), the shorter one rather less, than 

 double as long as the leaf-blade. Then comes a some- 

 what abrupt transition, and the outer scales do not, 

 of course, correspond to stages in the development of 

 a normal leaf. A rudimentary leaf, such as that in 

 fig. 70, is followed by a scale of quite a different 

 form : broader, wrapping round the bud, and consisting 

 of three parts nearly but not quite equal in length, 

 and separated almost to the base (fig. 71) ; the two 

 outer pieces representing the stipules are rather 

 broader than the central. In the next (fig. 72) the 

 leaf-blade is rather longer than the stipules, and the 

 common stalk or leaf-base is longer in proportion. 

 This is still more the case in the next two (figs. 73, 74). 

 In the twelfth (fig. 75) the leaf-stalk is abruptly trun- 

 cated ; and in the following the stalk and stipules are 

 reduced to three small prominences. Finally, the outer 

 scale is much shorter and broader in proportion (fig. 79). 



THE TULIP TREE (Liriodendron tulipifera) 



In the Tulip Tree the leaf commences as a slight 

 projection immediately below the growing-point, and 



