46 BUDS AND STIPULES 



CHAPTER III 



ON THE DEVELOPMENT OF LEAVES AND STIPULES 



In order to arrive at a satisfactory view as to the 

 structure and arrangement of buds it is necessary to 

 study the development of the leaf. Steinheil (4), in 1837, 

 was the first who approached the consideration of the 

 subject in this rational manner; and we are also in- 



B 

 $ 



a At 



Fig. 58. Growing-point and Beginning of First Leaf of Boss. 



Highly magnified. 



S, apex of growing-point ; B, youngest leaf ; R, cortex ; i/, pith. 



debted for excellent memoirs and observations to De 

 Mercklin (5) in 1846, Trecul (6) in 1853, Schacht (7) in 

 1854, Eichler (8) in 1861, Goebel (9), and others. 



Speaking generally, we may say that a leaf com- 

 mences as a small conical projection immediately below 

 the growing-point of the shoot (fig. 58). It continues 

 to grow at its apex for a short time only, its develop- 



